Question

An 92-kg football player traveling 5.0m/s in stopped in 10s by a tackler. What is the original kinetic energy of the player? Express your answer to two significant figures and include the appropriate units. What average power is required to stop him? Express your answer to two significant figures and include the appropriate units.

Answer 1

Step-by-step explanation:

It is given that,

Mass of the football player, m = 92 kg

Velocity of player, v = 5 m/s

Time taken, t = 10 s

(1) We need to find the original kinetic energy of the player. It is given by :

`k=(1)/(2)mv^2`

`k=(1)/(2)* (92\ kg)* (5\ m/s)^2`

k = 1150 J

In two significant figure,
`k=1.2* 10^3\ J`

(2) We know that work done is equal to the change in kinetic energy. Work done per unit time is called power of the player. We need to find the average power required to stop him. So, his final velocity v = 0

i.e.
`P=(W)/(t)=(\Delta K)/(t)`

`P=((1)/(2)* (92\ kg)* (5\ m/s)^2)/(10\ s)`

P = 115 watts

In two significant figures,
`P=1.2* 10^2\ Watts`

Hence, this is the required solution.