Question

Velocity of a body changes with time as V=20-5t. Time after which velocity becomes zero is​

Answer 1

Answer:

v=20-5t =0 at t time

20 =5t

t = 20/5 = 4

Answer 2

Answer:

The body is undergoing in a non-uniform acceleration.

Given:

\mathrm{v}=20+0.1 \mathrm{t}^{2}v=20+0.1t

2

Solution:

On differentiating the velocity with time,

a=\frac{d v}{d t}=0.2 ta=

dt

dv

=0.2t

From above, it is clear that acceleration of depends on time. The acceleration increases with increase in time or it will decrease with increase in time. Therefore, acceleration of body is non-uniform.

If the body is under uniform acceleration, then there will be constant acceleration with change in time.