For a specific roller coaster, the cart and its riders are brought to rest using a series of electromagnets. One 80 kg rider used a force sensor to measure the average force experienced during the slowing of the cart. The rider experienced an average force of 2600 N over a duration of 1.6 s. What was the rider’s initial speed before coming to rest? *

Considering only the earth's rotation, determine how much later the asteroid would have had to arrive to put the explosion above helsinki at longitude 25˚ e? this would have obliterated the city.

The man of mass m1 and the woman of mass m2 are standing on opposite ends of the platform of mass m0 which moves with negligible friction and is initially at rest with s = 0. the man and woman begin to approach each other. derive an expression for the displacement s of the platform when the two meet in terms of the displacement x1 of the man relative to the platform.

The friction of the water on a boat produces an acceleration of -10. m/s2. if the boat is traveling at 30. m/s and the motor is shut off, how long it take the boat to slow down to 5.0 m/s?