13. A car is travelling at 25 m/s. After applying brakes, the car comes to rest. During this interval it travels a distance of 50 m. If the same car was travelling at 50 m/s, what is its stopping distance? stopping distance: the distance travelled by the car after applying brakes and before the car comes to rest) A) 100 m B) 150 m C) 200 m D) 1250 m 14. When velocity and acceleration have the same sign, the object is: A) not moving B) speeding up C) slowing down 15. After the Pendulum motion lab, you plotted T2 vs 1 graph. You found the slope of the graph to be 4 (m/s2)-1. Based on the slope, what is the value of g? (T: period of pendulum, 1 = length of pendulum) A) 9.87 m/s2 B) 4 m/s2 C) 157.95 m/s2 D) 0 m/s2 16. A pendulum with length 'I' has period 'T'. When its length is increased four-folds, the new time period is: (assume g is constant) A) 0.5 T B) T C) 2T D) 4T 17. The ratio of time period of a pendulum of length 'l' on Earth and on planet X is 2:3. What is the acceleration due to gravity on planet X? (Acceleration due to gravity on earth: 9.8 m/s?) A) 6.53 m/s2 B) 4.36 m/s2 C) 14.7 m/s2 D) 19.6 m/s2 18. In Force and Motion online lab, frictional force is always in opposite direction to: A) normal force B) weight of the body C) applied force 19. You are pushing a 15 kg cart full of 25 kg of bottled water up a 10 degree ramp. If the coefficient of friction is 0.02, what is the friction force you must overcome to push the cart up the ramp? A) 7.72 N B) 2.90 N C) 4.93 N D) 7.84 N20. Which of the following is true about projectile motion (assume there '5 no air resistance)? A) x- component of velocity is constant C) both A and B B) horizontal component of acceleratiOn is zero D) none of the above