COMEDK · Physics · 5. Laws of Motion
A force of \(20 \mathrm{~N}\) is applied on a body of mass \(5 \mathrm{~kg}\) resting on a horizontal plane. The body gains a kinetic energy of \(10 \mathrm{~J}\) after it moves a distance \(2 \mathrm{~m}\). The frictional force is
- A \(10 \mathrm{~N}\)
- B \(15 \mathrm{~N}\)
- C \(20 \mathrm{~N}\)
- D \(30 \mathrm{~N}\)
Answer & Solution
Correct Answer
(B) \(15 \mathrm{~N}\)
Step-by-step Solution
Detailed explanation
Given, force \(F=20 \mathrm{~N}\) \[ m=5 \mathrm{~kg} \] Net force on the body, \[ F_{\text {net }}=F-f_{s} \quad \text { [where, } \int_{s}=\text { friction] } \] \(\therefore\) Work done by displacing \(2 \mathrm{~m}\) is given as…
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
- Television frequencies are of the order of \(100 \mathrm{MHz}\), while radio frequencies are of the order of \(1 \mathrm{MHz}\). Using these as typical frequencies, the ratio of the emf generated in a loop antenna by a television wave to that generated by a radio wave, if both have equal electric field intensities.COMEDK 2022 Hard
- Radium having mass number 200 and binding energy per nucleon 5.6 MeV , splits into two fragments Cadmium of mass number 112 and Hassium of mass number 108. If the binding energy per nucleon for Cadmium and Hassium is approximately 8.0 MeV , then the energy Q released per fission will be:COMEDK 2025 Medium
- A ball is projected horizontally with a velocity of \(5 \mathrm{~ms}^{-1}\) from the top of a building \(19.6 \mathrm{~m}\) high. How long will the ball take to hit the ground?COMEDK 2023 Easy
- Speed of electromagnetic wave in a medium having relative permittivity \(\varepsilon_r\) and relative permeability \(\mu_r\) is (speed of light in air, \(\left.c=3 \times 10^8 \mathrm{~m} / \mathrm{s}\right)\)COMEDK 2022 Easy
- An optical fibre communication system works on a wavelength of \(1.3 \mu \mathrm{m}\). The number of subscribers it can feed, if a channel requires \(20 \mathrm{kHz}\) areCOMEDK 2021 Medium
- What should be the value of the inductance of the coil which is to be connected to 220 V , 50 Hz supply so that maximum current of \(3 \sqrt{2} A\) flows through the circuit?COMEDK 2025 Medium
More PYQs from COMEDK
- If \(\omega\) is a cube root of unity, then the value of \(\operatorname{determinant}\left|\begin{array}{ccc}1+\omega & \omega^{2} & \omega \\ \omega^{2}+\omega & -\omega & \omega^{2} \\ 1+\omega^{2} & \omega & \omega^{2}\end{array}\right|\) is equal toCOMEDK 2012 Easy
- Arrange the following amines in the decreasing order of their solubilities in water.
COMEDK 2024 Medium - Decomposition of hydrogen peroxide can be prevented by addingCOMEDK 2023 Easy
- In the group \(Q-\{1\}\) under the binary operation * defined by \(a * b=a+b+a b\) the inverse of 10 isCOMEDK 2018 Easy
- Which of the following inert gas compounds is not formed?COMEDK 2014 Easy
- If \(2 A+3 B=\left[\begin{array}{ccc}2 & -1 & 4 \\ 3 & 2 & 5\end{array}\right]\) and \(A+2 B=\left[\begin{array}{lll}5 & 0 & 3 \\ 1 & 6 & 2\end{array}\right]\) then \(B=\)COMEDK 2023 Easy