college physics
posted by Jeff Rey .
two balls of equal mass,moving with speeds of 5 meter/seconds,collide head on.find the velocity of each after impact if (a)they are stuck together (b)the collision of perfectly elastic. (c)the coefficient of restitution in 1/3?

(a) 0
(b) 5 m/s and 5 m/s
(in opposite directions)
(c) sqrt(25/3) = 2.89 m/s
and 2.89 m/s
(in opposite directions) 
a car accelerated from rest at 2 m/ s reached of 20 m/ s . it moved at this velocity for 50s and then started brake and stopped after 5s . find the total distance by this car from the starting point?