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Question

A 60 kg mass is pushed with a enough force to start it moving and the same force is continued to act afterward. If the coefficient of static friction and sliding friction are 0.5 and 0.4 respectively, then the acceleration of the body will be

A
1 ms2
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B
3.9 ms2
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C
4.9 ms2
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D
6 ms2
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Solution

The correct option is A 1 ms2
Kinetic friction
=μkR=μkmg=0.4×60×10=240 N
and the limiting friction
=μSR=μSmg=0.5×60×10=300 N
So, the force applied on the body is 300 N and if the body is moving afterwards with the same force, then
Net accelerating force
= Applied force Kinetic force
ma=300240
a=60m=6060=1 ms2.

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