Question

 A body starts from rest and travels with an acceleration of 2 m/s². After t seconds its velocity is 10 m/s. Then t is *

(a) 10 s

(b) 5 s

(c) 20 s

(d) 6 s​

Answer 1

Answer:

GIVEN

Acceleration = 2m/s²

Velocity = 10m/s

SOLUTION

Acceleration = Velocity / time

2 = 10 /time

time = 10/2

time = 5 sec

So, The correct option is 5sec

Answer 2

Given: Given that a body starts from rest and travels with an acceleration of 2 m/s². After t seconds its velocity is 10 m/s.

To find: We have to find the value of t.

Solution:

From the law of acceleration we know that

$a=\dfrac{v-u}{t}$

where a is the acceleration.

v is the final velocity after some time.

u is the initial velocity.

t is the time.

Here, a=2 m/s²

v=10m/s

The body start from rest so, u=0

We have to find out the value of t.

Putting the values of a and v in the above equation we get

$2=\dfrac{10}{t}$

$t=\dfrac{10}{2}$

t=5

So, the value of t is 5 second.