yoyo try this out...?

Question

the fastest speed ever recorded for a human was for robert hayes who ran 12.5m/s for a part of race.A Porsche 911 turbo can reach 60mph in 4.6s suppose if robert maintainshis top speed and that the car starts just as he passes it.where and when do they meet?what are their velocities at this point?

Answer 1

For the car:

D = (0.5) * a * T^2

For the runner

D = v * T

Both equations can be set equal to one another. you know a and v. solve for T to get the time, solve for D (after getting T) to get the place. As to velocity, we already know it for the runner. For the car:

V(f) = V(i) + a * T