8. john has to hit a bottle with a ball to win a prize. he throws a 0.4 kg ball with a velocity of 18 m/s. it hits a 0.2 kg bottle, and the bottle flies forward at 25 m/s. how fast is the ball traveling after hitting the bottle?

The ball is travelling with a speed of 5.5 m/s after hitting the bottle.

Explanation:

To calculate the speed of ball after the collision, we use the equation of law of conservation of momentum, which is given by:

where,

are the mass, initial velocity and final velocity of ball.

are the mass, initial velocity and final velocity of bottle.

We are given:

Putting values in above equation, we get:

Hence, the ball is travelling with a speed of 5.5 m/s after hitting the bottle.