Question

A car starts from rest and moves along the x-axis with constant acceleration 6 m sâ2 for 10 seconds. If it then continues with constant velocity, what distance will the car cover in 15 seconds since it started from rest ?
(1) 180 m
(2) 300 m
(3) 320 m
(4) 420 m

Answer 1

Here is your Answer :-

a= 6m/s^2
t = 10 seconds
u = 0

v = u+at
v = 0+6*10 = 60m/s

For first 10 seconds :-

s=ut + at^2/2
s= 0 + 6*100/2
s = 600/2 = 300 metres

So, for first 10 seconds the car travels 300m.

For last 5 seconds,

v = s/t
60 = s/5
60*5 = s
s = 300 metres

According to me, the answer should be (300+300)= 600m