Question

A man raises a weight of 1 kg to a height of 1 m and holds it there for 30 s.
How much work has he performed ?
(a) 9.8 J
(b) 9.8 x 30 J
(c) 9.8 x 31 J
(d) zero
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Answer 1

Answer:

are truck that a stop on the road has to be pushed hard to get into motion when the truck is moving a little it can be moved faster with a smaller less push why