Question

A car starts with an initial velocity of 10 m/s and accelerates at a rate of 5 m/s2
. Find the final velocity
when the car has travelled a distance of 30m. what time has been taken by the car for this motion?

Answer 1

hi....
As given, u-10m/s
acceleration, a-5m/s^2
distance, s- 30m and velocity (v)=x
using v^2-u^=2as
(x)^2-( 10)^2=2×5×30
( x)^2 -100= 300
(x)^2 = 400
x= 20m/s so velocity=20m/s
and using v=u+at, we get
time=2sec

Answer 2

hello friend
here , initial velocity , u= 10 m/ s
acceleration , a= 5m/ s²
final velocity ,v =?
distance covered ,S = 30 m
Now , we know that , v² - u² = 2as
v² - 10² = 2× 5 × 30
v² = 300 + 100 = 400
v = 20
v= 20 m / s
as we know , v= u + at
20 = 10 + 5t
10 = 5t
t = 2 sec.
hope it helps you.....