Question

A 2.35 kg ball is attached to a ceiling by a3.53 m long string. The height of the room is5.03 m .The acceleration of gravity is 9.8 m/s2.
What is the gravitational potential energyassociated with the ball relative to the ceiling?Answer in units of J.

Answer 1

Answer:-81.29 J

Explanation:

Given

mass of ball $m=2.35 kg$

Length of string $L=3.53 m$

height of Room $h=5.03 m$

Gravitational Potential Energy is given by

$P.E.=mgh$

where h=distance between datum and object

here Reference is ceiling

therefore $h=-3.53 m$

Potential Energy of ball w.r.t ceiling

$P.E.=2.35\times 9.8\times (-3.53)=-81.29 J$

i.e. 81.29 J of Energy is required to lift a ball of mass 2.35 kg to the ceiling