Question

find the initial velocity of a car which is stopped in 4 seconds by applying brakes. the retardation due to brakes is 5 m/s².​

Answer 1

Initial velocity, u=? 

Final velocity, v=0m/s (car is stopped) 

Acceleration, a=−2.5m/s2 (negative because it is retardation)

Time, t=10s 

Use the relation of the first equation of motion:

v=u+at

0=u+(−2.5)×10

u=25m/s

Answer 2

• Initial velocity of a car is 25 m/s...❤

• According to the given data, a car is stopped by brake application, which comes to rest after 10 seconds of movement. The equation of motion is to be calculated...❤