Which of the following statements about gravitational potential energy is not true?
a. its magnitude is related to the work done by lifting an object.

b it depends on the choice of a coordinate system.

c. it is equal to the force required to move an object times the distance it is moved.

d. it is equal to the kinetic energy of the falling object at y = 0.

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