Question

The engine in an imaginary sports car can provide constant power to the wheels over a range of speeds from 0 to 70 miles per hour (mph). At full power, the car can accelerate from zero to 32.0 in time 1.50 At full power, how long would it take for the car to accelerate from 0 to 64.0 ? Neglect friction and air resistance.

Answer 1

Use relation V=U+at, in first case
where V is final velocity
U is initial velocity
t is time
and find acceleration, a

Use the same relation in second case and put value above obtained value of a in it and find t..