Question

if the car moving at a speed of 144 km/hr would decelerate constantly at 5m/^2 in 5 seconds what would be its final velocity

Answer 1

Given
u=0
v=144kmph=144×
18
5
​
=40m/s
t=20sec
We know,
v=u+at
40=a×20
a=2m/s
2

Now,
s=ut+
2
1
​
at
2

s=
2
1
​
at
2
=
2
1
​
×2×20
2
=400m

Answer 2

Given
u=0
v=144kmph=144×
18
5
​
=40m/s
t=20sec
We know,
v=u+at
40=a×20
a=2m/s
2

Now,
s=ut+
2
1
​
at
2

s=
2
1
​
at
2
=
2
1
​
×2×20
2
=400m