Question

A man moves on staright horizontal road with a block of mass 2 kg in his hand the core
a distance of 40 m with an acceleration of 0.5 m/s, work done by the man on the block
during the motion is
A) 4000 J
B) 400 J
C)40
D) 0.4J
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Answer 1

Answer:

the answer is 400 J ??????