Question

A man lifts a Stone of mass 50kg to a height of 2m. Calculate the work done​

Answer 1

Answer:

Given : m=50 kg h=2 m t=2 s

Work done in lifting a block W=mgh=50×10×2=1000 J

Power developed P=

t

W

=

2

1000

=500 W

Explanation:

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Answer 2

$\bold{ANSWER≈}$

Let the PE on ground be zero.

Let g=9.8 m\s^2

PE of an object= m.g.h ( m= mass of the object; h = height from the ground)

= 20×2×9.8 = 392J of energy