Question

A car initially at set picks up a velocity of 72km/hr in 1/4mins.....Find the acceleration and the total distance covered

Answer 1

72km/hr=20m/s

1/4min=15 sec
v=u+at
20=a×15
a=4/3 m/s

s=ut+1/2 at^2
=1/2×4/3×225
=90m

Answer 2

u=0m/s

v=72km/hr=72/1×5/18=20m/s

s=25m

By third equation of motion

v^2-u^2=2as

a=v^2-u^2/2s

a=400-0/2×25

a=400/50

a=8m/s^2