A 6.0 x 10^-2 kg tennis ball moves at velocity of 12 ,/s. the ball is struck by a racket, causing it to rebound in the opposite direction at a speed of 18 m/s. what is the change in the ball's momentum

1.8 Kg.m/s

Explanation:

Change in momentum is given by

where is the change in momentum, m is the mass of the ball, v is the final velocity of the ball and u is the initial velocity of the ball.

Substituting for m, -18 m/s for v since it's in opposite direction and 12 m/s for u then

blue light is scattered in different directions by the tiny molecules of air. blue is scattered more than other colours because it has a shorter distance to travel which results in smaller waves. this is why we see a blue sky most of the time.