 Motion and Force MCQs

31. When two bodies move toward each other with constant speeds the distance between them decreases at the rate of 6m / sec. If they move in the same direction the distance between them increases at the rate of 4m/sec. Then their speeds are
A. 5m/s, 1m/s
B. 3m/s, 3m/s
C. 6m/s, 1m/s
D. 4m/s, 2m/s

32. Distance covered by a freely falling body in 2 seconds will be
A. 4.9 m
B. 19.6 m
C. 39.2 m
D. 44.1 m

33. The distance covered by a body in time t starting from rest is
A. at2/2
B. Vt
C. a2t/2
D. at2

34. Flight of a rocket in the space is an example of
A. The second law of motion
B. Third law of motion
C. First law of motion
D. Law of gravitation

35. The trajectory (or path) of a projectile is
A. Straight line
B. Parabola
C. Hyperbola
D. Circle

36. At which angle the range of the projectile is maximum
A. 45°
B. 60°
C. 30°
D. None

37. The force bear by a wall on which water strikes normally at a speed of 10m/sec and at a discharge of 0.0001m3/sec is.
A. 1 N
B. 10 N
C. 100 N
D. None

38. The time rate of change of momentum is equal to
A. Force
B. Impulse
C. Velocity
D. Both A and C

39. The range of the projectile at 30° and 60° are
A. Equal to 45°
B. Equal to 90°
C. Equal to each other
D. None of the above