Question

Q11. A body starts from rest and travels with an acceleration of 20 m/s?. After t
seconds its velocity 10m/s then t is
(a) 10s
(b) 5 s
(c) 20 s
(d) 6​

Answer 1

Answer:

0.5 seconds.

Step-by-step explanation:

In the question,

The body starts from rest.

Hence,

u = 0

a = 20 m/s

v = 10 m/s

Let the time taken be t seconds.

Using the formula of acceleration,

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

$\frac{20}{1}$ = $\frac{10}{t}$

Cross multiplying,

20 t = 10

t = 10/20

t = 1 / 2

t = 0.5 seconds.

Your options are wrong or the question is wrong. So please clarify.

Hope helps !