(a)[1]
State Newton’s first law of motion by describing what happens when no resultant force acts on an object.
(b(i))[2]
After objects A and B collide, object A moves to the left at $0.40\,\text{m s}^{-1}$. Calculate the magnitude of object B’s velocity after the collision.
(b(ii))[1]
The collision between A and B is inelastic. Explain why the collision is inelastic and how it still follows the law of conservation of energy.