(a(i))[3]
Calculate the speed of trolley P as it moves to the left.
(a(ii))[3]
Calculate the kinetic energy of trolley Q when its speed is $0.36\text{ m s}^{-1}$.
(b)[2]
State the energy transfer that occurs as the spring expands.
Physics 0625 · IGCSE · Momentum
Momentum — practice question
Fig. 2.1 depicts two identical trolleys, P and Q, resting on a horizontal surface with no friction. A load is attached to trolley P.
Fig. 2.1 labels: trolley P, trolley Q, compressed spring, 1.5 kg load.
A compressed spring is placed between trolley P and trolley Q.
When the trolleys are let go, the spring extends and drives them apart.
Trolley Q travels to the right at a steady speed of $0.36\text{ m s}^{-1}$.
Each trolley has mass $1.2\text{ kg}$. The load on trolley P has mass $1.5\text{ kg}$.
The spring’s mass is negligible.