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Physics -- Kinematics and Forces
6.
Three particles A, B and C are thrown from the top of a tower with the same speed. A is thrown straight up, B is thrown
straight down and C is thrown horizontally. They hit the ground with speeds vA, vB and vC respectively.
- A.vA = vB = vC
- B.vB = vC = vA
- C.vA = vB = vC
- D.vA = vvB = vC
- Answer
- Report
Answer : [A]
7.
A balloon starts rising from the ground with an acceleration of 1.25 m/s2. After 8 s, a stone is released from the balloon. The stone will
- A.cover a distance of 40 m
- B.have a displacement of 50 m
- C.reach the ground in 4 s
- D.begin to move down after being released
- Answer
- Report
Answer : [C]
8.
A particle thrown up vertically reaches its highest point in time t1 and returns to the ground in a further time t2. The air resistance exerts a constant force on the particle opposite to its direction of motion.
- A.t1 > t2
- B.t1 = t2
- C.t1 < t2
- D.May be (a) or (c) depending on the ratio of the force of air resistance to the weight of the particle.
- Answer
- Report
Answer : [C]
9.
An aeroplane flying at a constant velocity releases a bomb. As the bomb drops down from the aeroplane,
- A.it will always be vertically below the aeroplane
- B.it will always be vertically below the aeroplane only if the aeroplane is flying horizontally
- C.it will always be vertically below the aeroplane only if the aeroplane is flying at an angle of 45 to the horizontal
- D.it will gradually fall behind the aeroplane if the aeroplane is flying horizontally
- Answer
- Report
Answer : [A]
10.
A projectile is moving at 60 m/s at its highest point, where it breaks into two equal parts due to an internal explosion. One part moves vertically up at 50 m/s with respect to the ground. The other part will move at
- A.110 m/s
- B.120 m/s
- C.130 m/s
- D.10√61m/s
- Answer
- Report
Answer : [C]
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