Question 1 (1 point) Which of the following graphs depicts uniform motion? K) A B C D E V V V/ k t t t t t QAand B Question 3 (1 point) Which collision has momentum conserved but not kinetic energy? (K) O explosion 0 closed Question 4 (1 point) Consider a rocket travelling in a straight line for a small distance. Choose the correct formula(s) for expressing the work done by the rocket. (K) O W: AER 1 w 1 1 O W: Emv; mvl O W: maAd 0 all of the above Question 5 (1 point) Which statement is true of fictitious forces? (K) 0 They are found only in non-inertial frames of reference. 0 They are found only in inertial frames of reference. 0 They are caused by real factors such as gravity. 0 They are real forces even if their causes are not apparent. Question 2 (1 point) In an emergency braking exercise, a student driver stops a car travelling at 83 km/h [W] in a time of 4.0 5. What is the car's acceleration during this time? (The answer is expressed in units of m/sz.) (K) O 5.8 [W] Question 6 (1 point) Astronauts aboard a space station appear to be weightless. Why is this? (K) O The force of gravity in space is zero. 0 The force of gravity on an object in orbit is zero. 0 The space station is in free-fall, and gravity is the only force acting on it. Q The space station moves at a constant speed while in orbit. Question 7 (1 point) Choose the correct statement. (K) 0 Potential energy = kinetic energy + mechanical energy. 0 Gravitational potential energy = 9.8 m/sz. O Gravitational potential energy and kinetic energy are both measured in joules. 0 Kinetic energy takes the direction of the force applied to the object