A620-g object traveling at 2.1 m/s collides head-on with a 320-g object traveling in the opposite direction at 3.8 m/s. if the collision is perfectly elastic, what is the change in the kinetic energy of the 620-g object?

If the new moon happens on january 15th, what shape will it be on february 6th?

Achild has maximum walking speed of 1.6 m/s. what is the length of the child's legs? 0.26 m

During the apollo moon missions, astronauts were concerned about the effects of newton's third law of motion when: o a. they ejected waste water, because they were concerned that it would push them off course. o b. they reentered earth's atmosphere, because they were carrying heavy moon rocks. o c. they took off from earth, because a large force was required to generate large acceleration. o d. they detected incoming space debris, because the inertia of the debris could damage their ship.