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If a runner covers the last straight stretch of a race in 4s. during that time he speeds up from 5ms to 9ms. What is the runners acceleration in this part of the race?
Wiki User
∙ 12y ago
4m/s
Acceleration = velocity change / time = (9m/s - 5m/s) / 4 sec
A = (9-5) / 4 = 1 m/s2.
Wiki User
∙ 12y ago
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Vi = 5 m/s A = (V_f- V_i )/t = (9 m⁄s- 5 m⁄s )/(4 sec) = (4 m⁄s )/(4 sec) = Vf = 9 m/s Change in time = 4 sec
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