Physics
Force and Motion
Page 11 of 11
#81 The speed of projectile at its highest point if it is projected with initial velocity v and at an angle of 45° with the horizontal.
A) \(v/2\)
B) \(v/\sqrt{2}\)
C) \(v/2\)
D) \(v/\sqrt{3}\)
#82 The distance covered by a body in time t starting from rest is
A) \(at^2/2\)
B) \(vt\)
C) \(at^2/2\)
D) \(at^2\)
#83 A train of 150 m length is going toward north at 10 m/s, and a parrot flying south at 5 m/s. The time to cross the train is
A) 12 s
B) 8 s
C) 15 s
D) 10 s
#84 The speed of projectile at its highest point if it is projected with initial velocity v and at an angle of 45° with the horizontal.
A) \(v/2\)
B) \(v/\sqrt{2}\)
C) \(v/2\)
D) \(v/\sqrt{3}\)
#85 The weight of objects in a rocket when its engine is operating
A) Is constant
B) Is decreasing
C) Is increasing
D) Is zero
#86 The ratio of height and range of projectile when projected at angle \(\theta\) is
A) \(4 \tan \theta\)
B) \(\tan \theta/4\)
C) \(4 \tan \theta\)
D) \(\tan \theta + 4 \tan \theta + 4\)
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