A projectile is fired with a velocity of 100.3 m/sec. at an elevation of 60�. Th

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Question
A projectile is fired with a velocity of 100.3 m/sec. at an elevation of 60�. The velocity attained by the projectile when it is moving at a height of 100 m, is
Options
A. 70 m/sec.
B. 75 m/sec.
C. 80 m/sec.
D. 85 m/sec.
E. 90 m/sec.

Correct Answer

90 m/sec.

1. The following statement is one of the laws of Dynamic friction
Options
A. The force of friction always acts in a direction opposite to that in which a body is moving
B. The magnitude of the kinetic friction bears a constant ratio to the normal reaction between two surfaces. The ratio being slightly less than that in the case of limiting friction
C. For moderate speeds the force of friction remains constant but decreases slightly with the increase of speed
D. all the above.

4. Pick up the correct statement from the following for the structure shown in below figure.
Options
A. The horizontal reaction at A is 23t ?
B. The horizontal reaction at C is 23t ?
C. The vertical reaction at A is zero
D. The vertical reaction at C is 2 t ?
E. All the above.