A 0.21 kg baseball moving at +25 m/s is slowed to a stop by a catcher who exerts a constant force of −360 N. a) How long does it take this force to stop the ball? Answer in units of s.

0.0146 s

Explanation:

First of all, we can find the acceleration of the ball by using Newton's second law of motion:

where:

F = -360 N is the force acting on the ball

m = 0.21 kg is the mass of the ball

a is the acceleration

Solving for a,

Then the ball moves by uniformly accelerated motion, so we can use the following suvat equation:

where:

u = +25 m/s is the initial velocity

v = 0 is the final velocity (it comes to a stop)

is the acceleration

t is the time it takes for the ball to stop

Solving for t,

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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.