Mark O. answered • 05/13/19

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Use the kinematic equation

v = v_{o} + at

where v is the final velocity, vo is the initial velocity, a is the acceleration and t is the time.

In this problem,

v_{o} = 0, the cyclist starts from rest,

v = 15 m/s

t = 4.0s

a = v/t

a = 15 m/s / 4.0 s

a = 3.75 m/s^{2}