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NEET Sample Paper NEET Sample Test Paper-10

  • question_answer
    A man holds a ball of mass \[1/2\text{ }kg\] in his hand. He throws it vertically upward. During this process his hand moves up by 40cm the ball leaves his hand with an upward velocity of \[4m{{s}^{-1}},\] the constant force with which the man pushes the ball is:

    A)  2N                 

    B)  10N

    C)  15N               

    D)  7N

    Correct Answer: C

    Solution :

    Acceleration of the ball \[a=\frac{{{\upsilon }^{2}}}{2s}=\frac{{{(4)}^{2}}}{2\times 0.4}=20\,\,m/{{s}^{2}}\] Hence, force applied by the man             \[=m\,(a+g)\]                 \[=\frac{1}{2}\,\,(20+10)=15N\]


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