Question

A particle starting from rest undergoes
acceleration given by a = It - 21 m/s? where t is
time in sec. Find velocity of particle after 4 sec.
is :-​

Answer 1

Answer:

-68

means velocity will be oppo.

Explanation:

because of the integration of 1t-21

we get 1t^2-21t

therefore after putting 4 sec. we will get -68