44. All of the following situations are examples of Law of Interation except. A Hitting the wall
C. driving a car with a constant speed
B. Rowing a boat
D. walking
45. The ball is travelling 45 m/s to the right when it is hit with a force of 3,200N. What is the mass of
the ball?
A. 71Kg
B. 75Kg
C. 80Kg
D. 90Kg
46. A 4,5 kg body is raised up to a height of 10 m. What is it potential energy?
A. 45J
B. 45 m/s
C. 441)
D. 44100 m/s
47. Calculate the kinetic energy of a 10 kg object moving with a speed of 5 m/s
A. 50 J
B. 125 J
C. 2J
D. 490J
48. A body of mass 2 kg is projected vertically upwards with a speed of 3 m/s. What is the maximum
value of the body's kinetic energy?
A. 9 J
B. 9.5 J
C.10 J
D. 10.5 J
49. How does sound energy travels?
A. Through wavelength B. Through air C. Through sound waves D. Through Echo
50. Mr. Lee scream his name inside the tunnel. He notice that the sound travels back to his ear because
the sound reflected off the wall of the tunnel. What do you call that reflected sound??
A. Refraction B Reflection
C. Sound
D. Echo