Question

What is the average velocity of the particle from rest to 15 seconds?

Answer 1

Displacement/Time = 21m / 15s .

That's choice-D .

Answer 2

Answer : The correct option is, (D) 1.4 meters/second

Solution :

Average velocity : It is defined as the displacement per unit time.

Formula used for average velocity :

$v_{av}=\frac{d}{t}$

where,

$v_{av}$ = average velocity

d = displacement of the particle

t = time taken

Now put all the given values in the above formula, we get the average velocity of the particle.

$v_{av}=\frac{(21-0)m}{15s}=1.4m/s$

Therefore, the average velocity of the particle is, 1.4 meter/second.