Question

A car moving with 40 m/s applies brakes to stop within 200m distance. Find time taken.

Answer 1

Answer:

Time =distance/speed

Time =200/40

Time =5

Answer 2

Answer:

10 s

Explanation:

given,

u(initial speed) = 40m/s

v(final speed) = 0 m/s        [car stops at last]

d(distance travelled) = 200m

using v² = u² + 2as we get

a= -4

then using v = u + at  

                 0 = 40 + (-4)t

                 0 = 40 - 4t

                 40 = 4t    

                          ⇒ t = 10s