CAPE Physics Unit 1 · 2007 (Specimen) · Paper 1 · Question Q7

A monkey of mass 20\text{ kg} rides on a 40\text{ kg} trolley moving with a steady speed of 8\text{ m s}^{-1} along a flat surface. The monkey jumps vertically to grab the overhanging branch of a tree. At what speed will the trolley move off?

1. (A)12\text{ m s}^{-1}
2. (B)8\text{ m s}^{-1}
3. (C)5\text{ m s}^{-1}
4. (D)0\frac{1}{3}\text{ m s}^{-1}