## Answers

1.

m1gh - m2gh = 1/2 (m1+m2) v^2

v^2 = 2(m1-m2)gh/(m1+m2) = 2*5*9.8*2/15

v = 3.6148 m/s

2.

Power = Energy/time

95 km/h = 26.38 m/s

acceleration = 26.38/7.4 = 3.566 m/s2

distance = 1/2 a t^2 = 97.64 m

average speed = 97.64/7.4 = 13.2 m/s

P = 1400*3.566*13.2 = 65872 Watts

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