A0.145 kg baseball pitched at 35.0 m/s is hit on a horizontal line drive straight back at the pitcher at 56.0 m/s. if the contact time between the bat and ball is 5.00 × 10−3 calculate the force (assumed to be constant) between the ball and bat.

2639 N

Explanation:

The impulse on the baseball is given by:

(1)

where F is the force exerted on the ball and the contact time between the bat and the ball.

The impulse is also equal to the change in momentum of the ball:

(2)

where m is the ball's mass, v is its final velocity, u is its initial velocity.

By using (1) and (2) simultaneously we can write an expression for F, the force exerted on the ball:

where:

m = 0.145 kg

u = 35.0 m/s

v = -56.0 m/s

Substituting,

and the negative sign means that the force is simply in the opposite direction to the ball's initial direction.

whichever one it is, it's definitely not one that you included on the list you provided.

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.