Posted by confused on Monday, November 22, 2010 at 6:55pm.
Sprinting near the end of a race, a runner with a mass of 70 kg accelerates from a speed of 6 m/s to a speed of 9 m/s in 2 s.
(a) What is the runner's average acceleration during this time?
(b) To gain speed the runner produces a backward force on the ground, so that the ground pushes the runner forward providing the force necessary for acceleration. Calculate this average force.

physics  Normen, Friday, January 10, 2014 at 10:32pm
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