Question

A body starts from rest and travels with an acceleration of 1.5m/s² After t seconds its velocity is 6 m/s Then t is.... (a) 10 s (b) 5 s (c) 4 s (d) 6s​

Answer 1

Given :

1. A body starts from rest i.e. u=0

2. Acceleration =

$1.5 \: m {s}^{ - 2}$

3.Velocity after t seconds=

$6 \: m {s}^{ - 1}$

To find : Value of t

Solution :

We will use the equation

$v = u + a \times t$

Putting values in equation:

$6 = 0 + 1.5 \times t$

$t = 6 \div 1.5$

$t = 4$

Therefore, option C is correct that is t = 4 s.