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a. +65 m/s - (+45 m/s) / 12.0 s - 3.0 s = (+18 m/s) / (9.0 s) = +2.0 m/s2

b. Speed at t=3 is 10 m/s and speed at t=5 is 25 m/s
Change in Y= (25m/s)-(10m/s)= 15m/s
Change in X= (5 s) - (3 s) = 2s
(15 m/s) / (2 s) = 7.5 m/s2

c. v= v+ at, a=-g = -9.8 m/s2
v= 0 m/s = (-9.8 m/s2)(4.0 s)
v= -39 m/s (downward)
distance= vt + 1/2 at2
d= 0 + 1/2 (-9.8 m/s2)(16 s2)
d= -78 m (downward)

d. negative because the car is slowing down and not speeding up

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