Question

A body of mass 3 kg is thrown vertically upwards with an initial velocity of 20m/s. what will be it's potential energy at the end of 2 s?​

Answer 1

Answer:

600J

Explanation:

First font out height the ball has travelled using the following equation -

h=ut-1/2gt^2 ,

where u is initial velocity

g is acceleration due to gravity(10 taken)

t is time (given in question).

Solving h comes out to be 20m.

Then use the following equation to get potential energy gained by the ball -

PE=mgh

where m is mass of the ball

g is acceleration due to gravity

h is height ( determined above)

Hehe.