Polly ester and ray ahn are doing the elastic collision lab on a low-friction track. cart a has a mass of 1.00 kg and is moving rightward at 27.6 cm/s prior to the collision with cart b. cart b has a mass of 0.50 kg and is moving leftward with a speed of 42.9 cm/s. after the magnetic repulsion of the two carts, cart a is moving leftward at 10.1 cm/s. determine the post-collision speed and direction of cart b in cm/s. cm/s

69. air frictionthe velocity of the satellitea. decreases b. increases c. sometimes increases sometimedecreases d. no effect at all70. the unit of gravitational potential energy isa. jouté b. watt c. newtond. pascal71. which of the following is not influenced by a magneta. cobalt b. copper c. irond. nickel72. one joule of work done in one second by unit positive chargea.1 watt b.1 volt c.1 js d. none73. the most deviated colour of light after passing through a prisea. violet b. red c. green d. yellow4. a coin is placed below a beaker fill with water upto 12 cm isdisplaced by water isa. 9cm b.6cmс.3cmd.7cm