Question

the velocity of a particle at an instant is 10 ms. after 5 sec if its velocity is 20 ms find its velocity 3 sec earlier

Answer 1

We can calculate acceleration as v-u/t

20-10/5=2m/s^2

Now 3sec earlier means 2 seconds after attaining 10m/s

Therefore

v=u+a*t

v=10+2*2

v=14m/s

Answer 2

Answer:

4m/s will be correct answer

Explanation: