How long does it take for a material point to change its speed from 10m / s to 15m / s moving with an acceleration of 0.5m / s2.
Acceleration at uniformly accelerated rectilinear motion:
a = (v2 – v1) / t,
where v2 and v1 are the final and initial speeds, t is the time during which the speed changed.
t = (v2 – v1) / a = (15 m / s – 10 m / s) / 0.5 m / s2 = (5 m / s) / (0.5 m / s2) = 10 s.
Answer: 10 s.
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