Question

If the speed of car is doubled,how much distance will it cover before stopping under the same retarding force.

Answer 1

hey mate,

from equation :

v²=u²-2as

since v=0

thus, u²=2as

or u is directly proportional to s

(a is constant since f and m are constant)

thus, on doubling the speed the distance covered will be √2 times the intial

for example :if the initial distance was 5 m then the final distance will be 5√2 m when speed is doubled