Question

A body moving along a straight line at 30m/s undergoes an
acceleration of -6m/s 2 .
The velocity of the object after 2 seconds will be:
(a) 18m/s
(b) 12m/s
(c) 16m/s
(d) 28m/s
​

Answer 1

Given :-

★ Initial velocity, u = 30 m/s

★ Acceleration, a = -6 m/s²

To Find :-

★ Velocity of the object after 2 sec

Solution :-

We know,

First equation of motion _____

$\boxed{\sf v = u +at}$

Where,

u = Initial velocity = 30 m/s

v = Final velocity

a = Acceleration = -6 m/s²

Substituting the values, we get

⟹ v = 30 + (-6) × 2

⟹ v = 18 m/s

Hence,

the velocity of the object after 2 sec is 18 m/s

Therefore, option (a) is correct.