Question

7. A car with speed 72km/hr suddenly applies break. The break has maximum ability to decelerate
with 5ms/-2). Find time taken to stop the car after applying breaks?A car with speed 72km/hr
suddenly applies break. The break has maximum ability to decelerate with 5ms^(-2). Find time taken
to stop the car after applying breaks?
(a) 2sec
ec
(b) 3sec
(c) 4sec
(d) 5sec​

Answer 1

Answer:

c) 4sec

Explanation:

u=72km/hr=20m/s

v=0

acc=-5m/s2

v=u+at

0=20+(-5*t)

-20=-5t

-20/5=-t

-4=-t

4=t

Answer 2

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