JEE Mains · Physics · STD 11 - 4.2 friction
Consider a block and trolley system as shown in figure. If the coefficient of kinetic friction between the trolley and the surface is \(0.04\) , the acceleration of the system in \(\mathrm{ms}^{-2}\) is _______. (Consider that the string is massless and unstretchable and the pulley is also massless and frictionless)
- A \(3\)
- B \(4\)
- C \(2\)
- D \(1.2\)
Answer & Solution
Correct Answer
(C) \(2\)
Step-by-step Solution
Detailed explanation
\(\mathrm{f}_{\mathrm{k}}=\mu \mathrm{N}=0.04 \times 20 \mathrm{~g}=8 \text { Newton }\) \(\mathrm{a}=\frac{60-8}{26}=2 \mathrm{~m} / \mathrm{s}^2\)
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