1.

A car starting from rest, accelerates at a constant rate of 5 ms for some time. It then retards at a constant rate of 10 ms and finally comes to rest. If the total time taken is 6 s, what is the maximum speed attained by the car:

Answer»

`10 ms^(-1)`
`40 ms^(-1)`
`20 ms^(-1)`
`5 ms^(-1)`

Solution :`V_(MAX)=(alphabeta)/(alpha+beta).t=(5xx10)/(5+10)xx6=(300)/(15)=20 ms^(-1)`


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