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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
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Answer : [A]
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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
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Answer : [C]
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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.
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Answer : [C]
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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
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Answer : [A]
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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
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Answer : [C]
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