JEE Mains · Physics · STD 11 - 4.1 newtons laws of motion
A man (mass \(= 50\, kg\)) and his son (mass \(= 20\, kg\)) are standing on a frictionless surface facing each other. The man pushes his son so that he starts moving at a speed of \(0.70\, ms^{-1}\) with respect to the man. The speed of the man with respect to the surface is ........ \(ms^{-1}\)
- A \(0.47\)
- B \(0.28\)
- C \(0.14\)
- D \(0.20\)
Answer & Solution
Correct Answer
(D) \(0.20\)
Step-by-step Solution
Detailed explanation
\(\begin{array}{l} \Rightarrow 0 = 50{V_1} - 20{V_2}\,and\,{V_1} + {V_2} = 0.7\\ \Rightarrow \,{V_1} = 0.2 \end{array}\)
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Physics
- One plano-convex and one plano-concave lens of same radius of curvature \(‘R’\) but of different materials are joined side by side as shown in the figure. If the refractive index of the material of \(1\) is \(\mu_1\) and that of \(2\) is \(\mu _2\), then the focal length of the combination is
JEE Mains 2019 Hard - For the circuit shown, the value of current at time \({t}=3.2\, {s}\) will be ...... \({A}\). [Voltage distribution \(V(t)\) is shown by Fig. \((1)\) and the circuit is shown in Fig. \((2)\)]
JEE Mains 2021 Hard - In an electrical circuit, a battery is connected to pass \(20\, C\) of charge through it in a certain given time. The potential difference between two plates of the battery is maintained at \(15\, V\). The work done by the battery is ........... \(J\).JEE Mains 2021 Easy
- A particle of mass \(1\, {kg}\) is hanging from a spring of force constant \(100\, {Nm}^{-1 .}\) The mass is pulled slightly downward and released so that it executes free simple harmonic motion with time period \({T}\). The time when the kinetic energy and potential energy of the system will become equal, is \(\frac{{T}}{{x}}\). The value of \({x}\) is ..... .JEE Mains 2021 Hard
- A particle performs simple harmonic motion with a period of \(2\) second. The time taken by the particle to cover a displacement equal to half of its amplitude from the mean position is \(\frac{1}{ a } s .\) The value of \('a'\) to the nearest integer is.........JEE Mains 2021 Medium
- A particle executes \(S.H.M.\) of amplitude A along \(x\)-axis. At \(t =0\), the position of the particle is \(x=\frac{A}{2}\) and it moves along positive \(x\)-axis the displacement of particle in time \(t\) is \(x=A \sin (\omega t+\delta)\), then the value \(\delta\) will beJEE Mains 2023 Medium
More PYQs from JEE Mains
- Match List\(-I\) with List\(-II:\)
Choose the correct answer from the options given below:List\(-I\) List\(-II\) \((A)\) \(3\) Translational degrees of freedom \((I)\) Monoatomic gases \((B)\) \(3\) Translational,\(2\) rotational degrees of freedoms \((II)\) Polyatomic gases \((C)\) \(3\) Translational,\(2\) rotational and \(1\) vibrational degrees of freedom \((III)\) Rigid diatomic gases \((D)\) \(3\) Translational,\(3\) rotational and more than one vibrational degrees of freedom \((IV)\) Nonrigid diatomic gases JEE Mains 2023 Medium - If \( \int_{0}^{1}4~cot^{-1}(1-2x+4x^{2})dx=a~tan^{-1}(2)-b~log_{c}(5), \) where a, b \( \in N \), then \( (2a+b) \) is equal to :JEE Mains 2026 Hard
- The area of the region \(\{(x, y):|x-y| \leq y \leq 4 \sqrt{x}\}\) isJEE Mains 2025 Medium
- Three rotten apples are accidently mixed with fifteen good apples. Assuming the random variable \(x\) to be the number of rotten apples in a draw of two apples, the variance of \(x\) isJEE Mains 2024 Hard
- A wire of length \(314\,cm\) carrying current of \(14\,A\) is bent to form a circle. The magnetic moment of the coil is \(........A- m ^{2}\). [Given \(\left.\pi=3.14\right]\)
JEE Mains 2022 Medium - Let the set of all values of \(p\), for which \(f(x)=\left(p^2-6 p+8\right)\left(\sin ^2 2 x-\cos ^2 2 x\right)+2(2-p) x+7\) does not have any critical point, be the interval \((a, b)\). Then \(16 a b\) is equal to ..........JEE Mains 2024 Hard