Question

Four men lift a 250 kg box to a height of 1m from ground and hold it without raising

or lowering it.

(a) How much work is done by the men in lifting the box ?

(b) How much work do they do in just holding it ?

(c) Why do they get tired of holding it for long. (g = 10ms- 2)

Answer 1

b.w= f cos0s
w=0
because force and displacement are perpendicular to each other
a.) p.e= mgh
p.e=250×10×1
p.e=2500j
c) they get tired holding it long because they handle the gravitational force acting on box in downwards direction

Answer 2

Answer:

Explanation:b.w= f cos0s

w=0

because force and displacement are perpendicular to each other

a.) p.e= mgh

p.e=250×10×1

p.e=2500j

c) they get tired holding it long because they handle the gravitational force acting on box in downwards direction

Read more on Brainly.in - https://brainly.in/question/2694428#readmore