Answer:
Hey, bro here is the explanation....
Explanation:
Hope it helps...
Answer:
a.8m/s is my ans it may help you

Actually Welcome to the Concept of the kinematics of a body.
Since, we know that Velocity = Distance / time
hence, V = 20/5 = 4 m/s
hence the velocity of the RC car is 4 m/s westwards direction.
The marbles that are 'more energetic' fall out of the tray, in the same way particles have enough energy to escape and turn into a gas.