Question

HELP!? What is the velocity of the truck after this elastic collision?
A car with a mass of 1.1 × 103 kilograms hits a stationary truck with a mass of 2.3 × 103 kilograms from the rear end. The initial velocity of the car is +22.0 meters/second. After the collision the velocity of the car is -11.0 meters/second

A. +1.3 meters/second
B. +2.5 meters/second
C. +5.3 meters/second
D. +7.5 meters/second
E. +9.8 meters/second

Answer 1

m1u1+m2u2=m1v1 + m2v2

Answer 2

u2 = 0


m1u1 - m1v1 = m2v2

v2 = (m1u1 - m1v1)/m2