A ball collides with a stationary toy train carriage. The velocity of the ball decreases from 1.2 m s−1 to the right to 0.10 m s−1 to the right. The carriage then collides with a stationary toy locomotive. The carriage and locomotive join together.

Calculate the speed in m s−1 of the locomotive and train carriage immediately after the second collision.

Alead ball is dropped into a lake from a diving board 5m above the water . it hits the water with a certain velocity and then sink with constant velocity in bottom . it reaches the bottom 5 second after it is dropped if g= 10m/s2 . find depth of the lake and average velocity of the ball ?

(2) (a) you have a simple circuit that consists of only a battery (δvbat=1.5v) and two resistors with resistance r1=10ω and r2=5ω, connected in series with each other. what is the current running through the battery? (b) you re-arrange your circuit so now r2 is attached in parallel to r1 rather than in series. what is the current running through the battery? (c) you add an additional resistor r3=7ω on the same branch as r2. what is the current running through the battery? (d) what is the power dissipated in r3?

The movement of electrons between atoms is called an