1) 60 mph = 60*0.44704 = 26.8224 m/s
20 mph = 20*0.44704 = 8.9408 m/s
using the equation of motion we have
v^2 - u^2 = 2aS
8.9408^2 - 26.8224^2 = 2*a*10
a = -32 m/s^2
v = u + at
8.9408 = 26.8224 + (-32)*t
t = 0.56 s
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