57. If a body moves in such a way that its velocity increases by equal amount in equal intervals of time, it is said to be moving with

A. a uniform retardation

B. a uniform acceleration

C. a variable acceleration

D. a variable retardation

58. Equation of motion of a point in a straight line, is

A. v = u + ft

B. S = ut + -1 ft2

C. 2fS = v2 - u2

D. all the above.

59. Time required to stop a car moving with a velocity 20 m/sec within a distance of 40 m, is

A. 2 sec

B. 3 sec

C. 4 sec

D. 5 sec

60. The velocity of a body fallen from height h, on reaching the ground is given by

A. v = 2gh

B. v = 2gh2

C. v = V2gh

D. v = 11V2gh h 2

61. A particle moves with a velocity of 2 m/sec in a straight line with a negative acceleration of 0.1 m/sec2. Time required to traverse a distance of 1.5 m, is

A. 40 sec

B. 30 sec

C. 20 sec

D. 15 sec

62. A particle moves along a straight line such that distance x traversed in t seconds is given by x = t2(t + 1), the acceleration of the particle, will be

A. 3t3 - 2f

B. 3t2 + 2f

C. 6t - 2

D. 6f + 2

63. A ball is dropped from the top of a vertical tower 60 m high and another ball is projected from the foot of the same tower upwards at the same time. If they meet at a height of 18 m, the velocity of projection of the second ball, is

A. 10 m/sec

B. 15 m/sec

C. 20.48 m/sec

D. 48.20 m/sec

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