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A motorcycle has a constant acceleration of 3.74 m/s2. Both the velocity and acceleration of the motorcycle point in the same direction. How much time is required for the motorcycle to change its speed from (a)21.5 to 31.5 m/s, and (b)51.5 to 61.5 m/s?(a)Number ______ Units_________(b)Number ______ Units_________

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Since the acceleration is constant we know that it is given by:


a=(v_f-v_0)/(t)

from where we have that:


t=(v_f-v_0)/(a)

once we have this equation we can determine the time by plugging the values of the acceleration and velocities.

a)

In this case we have that:


t=(31.5-21.5)/(3.74)=2.67

Therefore it takes 2.67 s.

b)

In this case we have that:


t=(61.5-51.5)/(3.74)=2.67

Therefore it takes 2.67 s.

User Delos Chang
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