9th Class Science Work and energy Question Bank Work and Energy

  • question_answer
    Read the given statements and select the correct option.
    Statement 1: If a light body and a heavy body possess the same momentum, the lighter body will possess more kinetic energy.
    Statement 2: The kinetic energy of a body varies as the square of its velocity.

    A) Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.

    B) Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.

    C) Statement 1 is true but statement 2 is false.

    D) Both statements 1 and 2 are false.

    Correct Answer: B

    Solution :

    Relation between momentum and \[\text{KE(}{{\text{E}}_{\text{K}}}\text{)}\] is \[p=\sqrt{2m{{E}_{k}}}\] If mass of body decreases then KE should increase accordingly to maintain constant momentum. Also, \[{{E}_{K}}=\frac{1}{2}m{{v}^{2}}\] or \[{{E}_{K}}\propto {{v}^{2}}\]


You need to login to perform this action.
You will be redirected in 3 sec spinner