Question

A small electric car has a maximum constant acceleration of 1 m s2,a maximum constant deceleration of 2m/s2 and a maximum speed of 72 km/hr. The amount of time it would take to drive this car one kilometer starting from rest and finishing at rest is

Answer 1

Explanation:

Time it takes to reach 20m/s.

v=u+at

=>t=20s

S=at2/2

=>S=400m

Time it takes to reach 0 again because it will start to decelerate

v=u+at

=>20=2t

=>t=10

Distance it will travel in this 10s=ut+at2/2 = 20x10-2x100/2

=100m

Total distance=500m time taken for it 30s

for distance 1000m time will be 60s since the same process will repeat again.

Hope it helps...

Thanks

Regards

Teevra Aryan Das