A2,100 kg car is lifted by a pulley. if the cable breaks at 4.50 m, what is the velocity of the car when it hits the ground? 88.0 m/s 9.39 m/s 8.36 m/s not enough information

A1,700kg car is being used to give a 1,400kg car a push start by exerting a force of 140n the impulse on the smaller car during the 30.0s of contact is +670kg*m/s. what is the impulse of the smaller car on the larger car? -814 kg*m/s 0kg *m/s -670kg*m/s -550kg*m/s

What is the weight of a feather (mass = 0.0001 kg) that floats through earth's and the moon's atmospheres?

Which of the following correctly describes what happens when an atomic bomb explodes? small pieces of fissionable material are joined and form a body with a mass greater than the critical mass, the relative number of neutrons escaping decreases, and a chain reaction and explosion result. large pieces of fissionable matter are brought together quickly and form a body with a mass smaller than the critical mass, the relative number of escaping neutrons increases, and a chain reaction and explosion result.