Question

1. If a car at rest accelerates uniformly to a speed of 144
Km/h in 20 seconds, it covers a distance of
a) 20 m b) 400 m c) 1440 m d) 2980 m​

Answer 1

Answer:

correct option is B

Explanation:

u=0

v=144kmph=144×185=40m/s

t=20sec

We know,

v=u+at

40=a×20

a=2m/s2

Now,

s=ut+21at2

s=21at2=21×2×202=400m