A 45.2-kg girl is standing on a 157-kg plank. Both originally at rest on a froze

Question

A 45.2-kg girl is standing on a 157-kg plank. Both originally at rest on a frozen lake that constitutes a frictionless, flat surface. The girl begins to walk along the plank at a constant velocity of 1.60i m/s relative to the plank. What is the velocity of the plank relative to the ice surface? What is the girl's velocity relative to the ice surface? 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 69.0-kg athlete jumps down onto the platform from a height of 0.730 m. While she is in contact with the platform during the time interval 0

Explanation / Answer

Q1)

a) (1.6 x 45.2)/157 = 0.4606m/sec., opposite direction.
b) (1.6 - 0.4606) = 1.139m/sec., forward.

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