72km/hr = 20 m/s (72*1000/3600)
To find the time it takes for the car to come to a stop, use the equation: v(final)=v(initial) + at
0=20 - 5t
t = 4 seconds.
To find the distance traveled,
use the equation: x = b + vt + (1/2)at^2, where x is x(final), b is x(initial), v is velocity (initial), t is time (seconds), and a is acceleration.
x=0+20(4)+(1/2)(-5)4^2
x=40 m
Physics question -A driver of a car travelling at 72km/h, applying brakes and accelerates uniformly in opposite direction at the rate of 5m/s2. How long will the car take to come into rest ? How far will the car covered a distance after applying bra
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1 answer