 # (a) Define the term 'average power'. (b) When a player hits a football, it moves along the curved path and then falls to the ground, Calculate the work done by the force of gravity on the football

(a) Define the term ‘average power’.
(b) When a player hits a football, it moves along the curved path and then falls to the ground, Calculate the work done by the force of gravity on the football.
© Two friends Ram and Shyam, each having zveight of 40 kg, go for rock climbing. Ram climbs to a height of 3 m in 10 s and Shyam covers the same height in 12 s. Is the work done by Ram and Shyam equal or not ? Compare the power of Ram and Shyam.

(a) Average power is defined as the ratio of total work done to the total time taken.
(b) When a player hits a football, it moves along the curved path and then falls to the ground, then work done by the force of gravity
W = mgh.
Since h = 0, therefore, W = 0
© Work done by Ram and Shyam is same because both have same weight and both climb equal height.
Power of Ram = PE / t = 40 x 9.8 x 3 /10
= 117.6 W
Power of Shyam = PE / t = 40 x 9.8 x 3/12
= 98 W
Power of Ram > Power of Shyam