A student investigates the motion of a toy car.
The toy car is released from rest and rolls down a slope.
The toy car has a mass of 0.050 kg.
The toy car moves with a velocity of 0.60 m/s when it reaches the bottom of the slope.
State the equation linking momentum, mass and velocity.
Calculate the momentum of the toy car when it reaches the bottom of the slope.
The toy car hits a stationary toy trailer and they stick together. The car and trailer move away together with a velocity of 0.20 m/s.
Calculate the mass of the trailer.
The student repeats the investigation using another identical trailer connected to the first trailer.
The student releases the toy car from the top of the slope in the same way as before. The toy car hits the trailers and they stick together.
The toy car and trailers move away together. The student concludes:
"The two trailers are identical, so their velocity will be the same as when there was just one trailer."
Discuss whether the student’s conclusion is correct or not.
