Question

a racing car has uniform acceleration of 4m/s what distance will it cover in 10s after start

Answer 1

a=4ms
4ms=velocity/10
velocity =40
speed =D/t
40=D/10
ditance is 400

Answer 2

Here initial velocity=u

final velocity=v
acceleration=a
time=t

u=0
a=4
t=10
use the first equation of motion i.e -v=u+at

v=0+40
v=40m/s
now use third equation of motion i.e-2as=v^2-u^2

2*4*s=1600

s+1600/8=200m