Question

On a highway a car of mass 1500 kg is stopped at traffic signal. A pickup of mass
2000 kg comes up from behind and hits the stopped car. Assuming the collision is
elastic, the pickup stops with collision and push the car ahead onto the highway
at 10.0 m/s. How fast was the pickup going just before the collision?​

Answer 1

Answer:

mass of car - 1500kg

mass of pickup -2000kg

car pushed = 10m/s

speed of pickup - 1500 / 2000 = 3/4

excact speed of car - 3/4 ×10 = 7.5m/s

Answer 2

Answer:

u2 = 8.75 m/s

Explanation:

we know that

u1 = 0 (because car is stop)

mass 1 = 1500 kg

mass 2 = 2000 kg

v1 after collision = 10.0 m/s

we need to find u2

we know that

v1 = (m1 - m2) / ( m1 + m2) × u1 + 2m2/ (m1 +m2) × u2

put the valuse and you get the vale of u2