Two students are playing paddle ball with a 5 kg spongy ball. If the ball is thrown at the batter with a speed of 5 m/s and bounces off with a speed of 10 m/s. What is the magnitude of the impulse imparted on the ball by the bat?

75 kgm/s

Explanation:

Impulse: This can be defined as the product of mass and change in velocity. The S. I unit is kgm/s.

From the question,

I = m (v-u) ... Equation 1

Where I = impulse, m = mass, v = final velocity, u = initial velocity.

Let the direction of the initial velocity be the positive direction.

Given: m = 5 kg, v = - 10 m/s (bounce off), u = 5 m/s.

Substitute into equation 1

I = 5 (-10-5)

I = 5 (-15)

I = - 75 kgm/s.

The negative sign tells that the impulse act in the same direction as the final velocity of the ball

Hence,

I = 75 kgm/s