Question

a car is initially moving with the speed of 30 metre per second it comes to rest in 3 seconds after applying brakes calculate the acceleration and distance covered by the car in 3 second

Answer 1

this is correct answer

Answer 2

given
initial velocity=30
v=0
t=3
a=v-u/t
a=0-30/3
a=-10
now
v2=u2+2as
so
(0)2=(30)2-2×(-10)×s
0=900-20s
20s=900
s=45m