Hi all

Q 1 )

Partical mothion At time t >= 0 the velcity of a body moving along the s-axis is v = t^2 - 4t + 3

a ) Find the body's acceleration each time the volicty is zero ?

b) When is the body moving forward ? bakward ?

c ) When is the body's velocity increasing ?

I solve a )

but about b an c ( How they solved )

a)

a(t) v' = 2t - 4

t = 1 , t = 3

a (3) = 2 , a(1) = -2

what about b and c