Afather racing his son has half the kinetic energy of the son, whohas three-fifths the mass of the father. the father speeds up by2.5 m/s and then has the same kinetic energy as the son. a) what is the original speed of the father? b) what is the original speed of the son?

What is the magnitude of the resultant vector round your answer to the nearest tenth

Which is an example of gaining a static charge by conduction? a) rubbing a balloon against your hair. b) shuffling your shoes across a carpet. c) bringing a charged rod near an electroscope. d) touching your car on a cold day and getting a shock.

Asled is being held at rest on a slope that makes an angle θ with the horizontal. after the sled is released, it slidesa distance d1 down the slope and then covers the distance d2 alongthe horizontal terrain before stopping. find the coefficient ofkinetic friction μk between the sled and the ground, assumingthat it is constant throughout the trip. find the coefficient of kinetic frictionμk. express your answer in terms of someor all of the variables d1, d2, and θ.