Question

In a Little League baseball game, the 145 g ball enters the strike zone with a speed of 15.0 m/s . The batter hits the ball, and it leaves his bat with a speed of 20.0 m/s in exactly the opposite direction?

Answer 1

5.075 N s

Step-by-step explanation:

mass, m = 145 g = 0.145 kg

initial velocity, u = 15 m/s

final velocity, v = - 20 m/s

Impulse = change in momentum

Impulse = m ( v - u)

Impulse = 0.145 ( 20 + 15)

Impulse = 5.075 N s

Thus, the impulse is 5.075 N s .

Answer 2

Step-by-step explanation:

Given

mass of ball
`m=145\ gm`

initial speed
`u=15\ m/s`

Final speed
`v=20\ m/s`

Impulse Delivered by bat to the ball

`J=change in\ momentum\ of\ ball`

`\Delta P=change\ in\ momentum`

`\Delta P=m(v-u)`

`\Delta P=0.145(-20-15)`

`\Delta P=-5.075\ N.s`

if ball makes a contact for t sec

then average force applied is

`F_(avg)=(\Delta P)/(t)`