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Question

A blocks is moved from rest through a distance of 4 m along a straight line path. The mass of the blocks if 5 kg and the force acting on it is 20 N. If the kinetic energy acquired by the block be 40 J, at what angle to the path the force is acting.

A
30o
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B
60o
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C
45o
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D
None of these
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Solution

The correct option is B 60o

Work done = increase in kinetic energy

Fcosθ.d=40

20cosθ×0.4=40

θ=cos1(12)=60o

Hence, angle is 60o


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