Related InterviewSolutions

• A ball is thrown down wards with velocity V from the top of a tower and it reaches the ground with speed 3V. what is the eight of the tower.(a) V2/g.(b) 2V2/g.(c) 4V2/g. (d) 8V2/g.
• A ball is thrown horizontally from the top of a tower. What happens to the horizontal component of its velocity.(a) increases (b) decreases(c) remains unchanged(d) first increases then decreases
• A ball is dropped from the top of a tower the distance covered by it in the last second is (9/25)th of the height of the tower what is the height of the tower.(a) 122.5 m (b) 100.5 m(c) 88.5 m(d) 64.5
• The friction of the air causes vertical retardation equal to one tenth of the acceleration due to gravity (take g = 10ms-2) the time of flight will be decreased by(a) 0% (b)1% (c) 9% (d) 11%
• Which of the following does not effect the maximum height attained by the projectile ?(a) magnitude of initial velocity(b) acceleration of the projectile(c) angle of the projection(d) mass of the projectile
• The range R of a projectile is same when its maximum heights are h1 & h2. What is the relation between R, h1 & h2?(a) R = √h1 h2  (b) R = √ 2h1 h2  (c) R = 2√h1 h2  (d) R = 4√h1 h2
• A projectile is fired at 30°. with momentum p, neglecting friction, the change in kinetic energy when it returns to the ground will be (a) zero (b) 30% (c) 60% (d) 100%
• A projectile is fired with speed u making angle θ with the horizontal. Its potential energy at the highest point is(a) (1/2) mu2 sin2θ(b) (1/2) mu2 cos2θ(c) (1/2) mu2(d) (1/2) mu2 sin2 2θ
• In the above questions, the change in momentum on return to the ground will be (a) zero (b) 30% (c) 60% (d) 100%
• Two balls of same mass are projected one vertically upwards and the other at angle 60°. with the vertical. The ratio of their potential energy at the highest point is (a) 3:2 (b) 2:1 (c) 4:1 (d) 4: 3