Question

Find time when body is at rest , given that s= t3

- 6t2+9t​

Answer 1

Answer:

s=t

3

−6t

2

+9t

dt

ds

=3t

2

−12t+9

v=0

0=3t

2

−12t+9

0=(t−1)(t−3)

t=1 and3