A force platform is a tool used to analyze the performance of athletes measuring the vertical force that the athlete exerts on the ground as a function of time. Starting from rest, a 60.0 kg athlete jumps down onto the platform from a height of 0.600 m. While she is in contact with the platform during the time interval 0 < t < 0.8 s, the force she exerts on it is described by the function below.
F = (9 200 N/s)t - (11 500 N/s2)t2
Assume the positive y-axis points upward.
(a) What was the athlete's velocity when she reached the platform?
Correct: Your answer is correct. j hat
(b) What impulse did the athlete receive from the platform?
Correct: Your answer is correct. j hat
(c) What impulse did the athlete receive from gravity while in contact with the platform?
Incorrect: Your answer is incorrect.
Your response differs from the correct answer by more than 10%. Double check your calculations. j hat
(d) With what velocity did she leave the platform?
Incorrect: Your answer is incorrect.
Your response differs from the correct answer by more than 100%. j hat
(e) To what height did she jump upon leaving the platform?