9th Class Science Time and Motion Question Bank

done Motion IIT JEE Subjective Problems Total Questions - 3

• question_answer1)
  A car starts from rest and travels with uniform acceleration\[\alpha \]for some time and then with uniform retardation\[\beta \]and comes to rest. If the total time of travel of the car is t, the maximum velocity attained by it is given by                         

  (a) \[\frac{\alpha \beta }{(\alpha +\beta )}t\]

  (b) \[\frac{1}{2}\frac{\alpha \beta }{(\alpha +\beta )}{{t}^{2}}\]

  (c) \[\frac{\alpha \beta }{(\alpha +\beta )}t\]

  (d) \[\frac{1}{2}\frac{\alpha \beta }{(\alpha -\beta )}{{t}^{2}}\]

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• question_answer2)
  Velocity time curve for a body projected vertically upwards is

  (a) Parabola

  (b) Ellipse

  (c) Hyperbola

  (d) Straight Line

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• question_answer3)
  A person travels along a straight road for the first half length with constant speed \[{{v}_{1}}\]and the second half length with a constant speed\[{{v}_{2}}\]. Average speed v is

  (a) \[\frac{{{v}_{1}}{{v}_{2}}}{2({{v}_{1}}+{{v}_{2}})}\]

  (b) \[\frac{2({{v}_{1}}+{{v}_{2}})}{{{v}_{1}}{{v}_{2}}}\]

  (c) \[\frac{2({{v}_{1}}+{{v}_{2}})}{{{v}_{1}}+{{v}_{2}}}\]

  (d) \[\frac{{{v}_{1}}+{{v}_{2}}}{{{v}_{1}}{{v}_{2}}}\]

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