A body of mass 5 kg is thrown vertically upwards so that it reaches a maximum height of 50 m in 20 seconds. Find the work done.
2500 J
For a ball which is thrown upwards, the work done is given by mgh.
Given mass m = 5 kg
height, h = 50 m
time taken = 20 sec
g = 10 ms−2
Therefore, work done = 5×10×50=2500 J