Question

You catch a 219 g ball moving at 6.1 m/s. If you catch the ball in a time period of
0.138 s what is the magnitude of the average force you must supply to the ball to
stop the ball?
Answer in units of Newtons (N)

Answer 1

Answer:

The magnitude of the average force to supply to the ball in order to stop the ball is 9.68 N.

Explanation:

Let's think Newton's 2nd Law: F = ma.

We are given the mass of the ball: 219 g ⇒ .219 kg.

We are given the initial velocity, time, and final velocity of the ball ∴ we can solve for acceleration.

We are trying to find the force needed to stop the ball.

Let's find the acceleration of the ball first.

• We have the initial velocity of the ball, 6.1 m/s.
• We have the time it would hypothetically take the ball to stop, .138 s.
• We have the final velocity of the ball, 0 m/s (since we are trying to stop the ball).

Now, we can plug these known values into this kinematic equation and solve for acceleration, a.

• v = v₀ + at
• 0 = 6.1 + a(.138)
• -6.1 = .138a
• a = 44.2029 m/s²

Substitute acceleration and mass into F = ma and solve for the force.

• F = (.219)(44.2029)
• F = 9.68 N

The magnitude of the average force to supply to the ball in order to stop the ball is 9.68 N.