Question

14. Calculate the height of a body of mass 5 kg lifted has energy 50 J.

Answer 1

Explanation:

Energy spent equals the Work done against gravity while lifting.

Where, W

Ext

=ΔU

Gravitational

Change in potential energy of the body in lifting the height h is given by:

ΔU=mgh

So, 1J=0.5×10m/s

2

×h

⇒ h=1/5=0.2m

Answer 2

Answer:

height of body= 1.0 ft. ..