71. A train moving at 30 kilometres per hour is struck by a bullet moving 500 m/sec at right angles to the train. The direction with which the bullet appears to strike the train, is

A. 30?

B. 60?

C. 60?

D. 90?,

72. A ship is moving N 48? 30' W at 20 knots/hour and a second ship is moving E 90? at 10 knots/hour, the relative velocity of the second ship with respect to first, is

A. 15 knots

B. 10 knots

C. 23 knots

D. 13 hnots.

73. A fighter plane flying horiozntally at an altitude of 4121 m with a velocity of 468 km/hour has aimed an enemy camp. In order to hit the camp, the exact distance of the plane from the camp, should be

A. 2770 m

B. 3770 m

C. 4770 m

D. 5770 m.

74. The path traced by a projectile in the sky, is

A. circular

B. parabolic

C. elliptical

D. catenary

75. Cartesian equation of a trajectory, isX2

A. y x sin a - g

B. y - x tan a -gX2

C. y = x tan a +

D. y - x tan a

76. Time of flight of a projectile on a horizontal plane, is

A.2u sin a

B.2u cos a

C.2u tan a

D.2u cot a

77. For maximum range of a projectile, the angle of projection should be

A.300

B.450

C. 60?

D. none of these.

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