A 5-kg sphere is dropped from a height of y = 2 m to test newly designed spring floors used in gymnastics. The mass of the floor section is 10 kg, and the effective stiffness of the floor is k = 120 kN/m. Knowing that the coefficient of restitution between the ball and the platform is 0.6, determine (a) the height h reached by the sphere after rebound, (b) the maximum force in the springs.

Aboat that travels with constant speed of 6.10 m/s in still water is to go directly across a river. the current in the river flows at 1.95 m/s. (a) at what angle must the boat be steered?

What is the radius of the circular path ofa charged particle in a magnetic field?

Astone is dropped with no initial velocity from the top of a cliff and hits the ground a time of 3.9 s later. what is the height of the cliff, in units of meters? you may assume that air resistance is negligible. give the answer as a positive number question 15 a figure skater is rotating at a rate of 200 revolutions per minute. what is the angular speed, in units of rad/s? 200 o 20.9 12000 o 3.33