Question

an Audi car is travelling with a speed 180 kmph if the driver applies brakes it decelarates at 10 M per second square find the distance travelled in last and last but one second

Answer 1

u mean the last one second?...if so the this is the ans.

180kmph= 50m/s

time taken to come to rest:

⇒v=u +at

0=50+(-10)t

t=5 secs

⇒s=ut+1/2at²

⇒s=50×5+1/2×(-10)×5²

s= 125m

so he has travelled 125 m before coming to rest.

so distance travelled in the last second is:

(total distance travelled) - (distance travelled in last 4 secs)

s travelled in the last four secs is:

s=50×4+1/2×(-10)×4²

s=120m

so distance travelled in the last second is:

125-120 = 5m.

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