Question

suppose the body is at rest initially after 5 seconds its velocity becomes 20 metre per second can I use equation v = u +at to find out its acceleration?explain why?

Answer 1

Answer:

Yes, we can use the equation "v = u + at" to calculate the acceleration at the given instant of time.

And acceleration 'a' = 4m/s^2

Explanation:

Since body was at rest initially, thus, u = 0m/s.

t = 5sec

v = 20m/s

a = ?

So,

To calculate acceleration 'a' we can use the equation "v = u + at" because all other variable except 'a' are known. Thus, after substituting the magnitudes of respective variables we can easily determine the acceleration of the moving object.

Thus, v = u + at

20 = 0 + a(5)

5a = 20

a = 4m/s^2.

Answer 2

Answer:

time t=seconds s,displacement s=metres m,velocity v or u=metres per second ms−1,acceleration a= metres per second per second ms−2. ==Example ...