An object has an acceleration of +1.4 m/s2. At t=4.0 s, its velocity is -4.5 m/s.
a) Find the object's velocities at t=1.0 s and t=7.0 s.
v= vₒ +a•t
vₒ =v-a•t= - 4.5 -1.4•4 = - 10.1 m/s
v1= vₒ +a•t1 = -10.1 +1.4•1 = - 8.7 m/s,
v2= vₒ +a•t2 = -10.1 +1.4•7 = - 0.3 m/s,