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`        a car starting from rest has a speed of 30km/h at any one instant. two seconds later, its speed is 36km/hr and 2sec after that, it is 42km/hr, its accelaration in m/s^2 is?`
3 years ago

Vikas TU
10603 Points
```							For fiest instant,v = u + at30 = 0 + a*t............(1)After 2 seconds that is after (t+2)36 = 30 + a(t+2)or6 = at + 2a..........(2)solving both eqns we get,2a = -24a = -12 m/s^2.which could not be possible as it has travelled further more after these 2 seconds but the accln is deccelation.Hence not possible.
```
3 years ago
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• Test paper with Video Solution
• Mind Map
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