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`        A trolley of mass 20 Kg carries 5 kg grain and moves on a horizontal, smooth and straight track at 20 m s-1. If the grain starts leaking out of a hole at the bottom at time t = 0, at rate 0.2 kg m s-1 the speed of the trolley at t = 10 s will be nearest to A) 20 m s-1 B) 25 m s-1 C) 15 m s-1 D) 13.3 m s-1 pls solve this problem...........`
6 years ago

SAGAR SINGH - IIT DELHI
879 Points
```										Dear student,
Its a conservation of momentum problem.
Momentum of trolley= momentum of grains
On solving we get the answer to be 15 m/s.

All the best.
Win exciting gifts by         answering the questions on Discussion Forum. So help discuss any       query   on askiitians forum and become an Elite Expert League    askiitian.

Sagar Singh
B.Tech, IIT Delhi

```
6 years ago
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