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```
An aitihasik starts from rest and reaches a speed of 54km/hr in 15 seconds the acceleration increases uniformly for first 9 seconds after this the acceleration reduces to zero uniformly in next 6 seconds . Find displacement in 15 second interval

```
3 years ago

## Answers : (1)

Saurabh Koranglekar
10341 Points
```							Dear studenta1 be acc for first 9 seca2 be acc for next 6 secnows9 = 0.5(at^2)= 40.5*a1similarly,s15-s9s = ut +0.5at^2u here is (a1*9);t=6;and a is a2;thus forming and simplifying equations answer can be obtainedalso 54 kmph is 15 m/sRegards
```
7 months ago
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