2. May (75 kg) and Amber (49 kg) stand motionless on ice skates, facing each other at arm's length on a smooth,
frozen pond. Which of the following actions will give Amber the least speed?
a) Amber pushes May with 500 N of force for 0.1 s.
b) Amber pushes May with 800 N of force for 0,08 s.
c) Amber pushes May with 600 N of force for 0,04 s.
d) May pushes Amber with 100 N of force for 0,6 s.
c) May pushes Amber with 300 N of force for 0.2 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