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(t) v' = 2t - 4
t = 1 , t = 3
a (3) = 2 , a(1) = -2
what about b and c