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Question

A body constrained to move along the z-axis of a co-ordinate system is subjected to a constant force F=(^i+2^j+3^k) N. What is the work done by the force in moving the body over a distance of 4 m along the z-axis?

A
6 J
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B
8 J
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C
16 J
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D
12 J
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Solution

The correct option is D 12 J
Given F=(^i+2^j+3^k) N
Since the body is constrained to move along the z - axis over a distance of 4 m
S=(4^k) m
Then, Work done, W =F.S
W=(^i+2^j+3^k).(4^k)
W=12 J

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