Two objects P and Q, travelling in the same direction start from rest. While the object P starts at time t = 0 and object Q starts later at t = 30 rnin. The object P has an acceleration of 40 km /h 2 . To catch P at a distance of 20 km, the acceleration of Q should be
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160 km /h 2
According to question,
Object P starts at t = 0 and acceleration of P = 40 km/h 2
The time taken by object P to cover 20 km will be, s = ut + 
at 2
Where, u = 0, s = 
at 2
Here, a = 40 km/h 2
and s = 20 km
= 1 hour
Time taken by Q will be 
hour, because it started after 30 min.
The acceleration in Q,
= 2 x 4 x 20
= 160 km/h 2
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