Question

Peggy is riding her bicycle at a constant speed of 2m/s. She accelerates and after 10.0 seconds, she is at a speed of 10m/s. What is Peggy’s acceleration?

Answer 1

Explanation:Acceleration is the measure of how fast the velocity changes. Velocity is a vector quantity and a change in velocity is due to change in magnitude or change in direction or both.  

Here, the boy is moving with constant speed but velocity changes and hence is supposed to be in accelerated motion.

Answer 2

Explanation:

Intial velocity=2m/s

final velocity=10m/s

time taken =10 s

Acceleration=final velocity-intial velocity/time

a=v-u/t

a=(10-2)/10

a=8/10

a=0.8m/s²

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