Question

A car is travelling at a speed of 72km/h, the brakes are applied to produce a uniform acceleration of -1 m/s2. Find the distance it travels after applying brakes so that it completely stops?


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Answer 1

Step-by-step explanation:

u = 72 km/hr

= 72*1000/3600

= 20 m/s

v = 0

a = -1 m/s^2

2as = v^2 - u^2

2 * -1 * s = 0^2 - 20 ^ 2

-2s = 0 - 400

s = -400 / -2

s = 200

Answer 2

Answer : 200s

Step-by-step explanation:

a: -1 m/S2

a=v-u/t

-1= 0- 200/t

cross multiplication

-t = -200

t=200s