Police are investigating an accident. they know that tom brady was driving 20 m/s before being hit by jay z head on. tom brady’s car has a mass of 1100 kg and jay z’s has a mass of 1475 kg. they also know that the two cars stuck together and were traveling 7 m/s in the same direction as jay z was driving. the speed limit was 25 m/s, was jay z speeding?

m = mass of tom brady's car = 1100 kg

v = initial velocity of tom brady's car before collision  = - 20 m/s

M = mass of jay Z's car = 1475 kg

V = initial velocity of jay Z's car before collision = ?

V' = velocity of the combination after collision = 7 m/s

Using conservation of momentum

m v + MV = (m + M) V'

(1100) (- 20) + (1475) V = (1100 + 1475) (7)

V = 27.14 m/s

u=13

v=30

s/t=u+1\2at

=13+431/2

=13+265.5

=278.5

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