A girl having mass of 35 kg sits on a trolley of mass 5 kg. The trolley is given an initial velocity of 4m//s by applying a force. The trolley comes to rest after travelling a distance of 16m. (a) How much work is done on the trolley ? (b) How much work is done by the girl ?

Explanation

Let's solve the problem step by step.

### Given Data:
- Mass of the girl, \( m_g = 35 \, \text{kg} \)
- Mass of the trolley, \( m_t = 5 \, \text{kg} \)
- Initial velocity of the trolley, \( u = 4 \, \text{m/s} \)
- Final velocity of the trolley, \( v = 0 \, \text{m/s} \) (since it comes to rest)
- Distance traveled by the trolley, \( s = 16 \, \text{m} \)
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