A 7.0 kg bowling ball traveling at 2.0 m/s collides with a stationary 0.5 kg beach ball in
an elastic collision. The bowling ball leaves the collision with a velocity of 1.5 m/s
traveling in the same direction as the beach ball.
Calculate the speed of the beach ball.
A 1.0 m/s
B 2.0 m/s
C 3.5 m/s
D 7.0 m/s

D 7.0 m/s

Explanation:

MU+mu=MV+mv

7×2+0.5×0 =7×1.5+0.5×v

14+0=10.5+0.5v

14-10.5= 0.5v

3.5=0.5v

0.5v0.5 =3.5/0.5

v= 7m/s

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.