Question

EXERCISE 7.1
1. A particle moves along a straight line in such a way that after t seconds its distance from the origin
is s = 212 + 3t metres.
(1) Find the average velocity between t == 3 and 1 = 6 seconds,
(ii) Find the instantaneous velocities at 1 =3 and 1=6 seconds.​

Answer 1

Step-by-step explanation:

S=t³-6²+3t+4

v= ds/dt

So =3t²−12+3=v

again differentiate ,a= dv/dt

6t−12=0

t=2s

v=3(2)²−12×2+3=−9ms-¹