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A ball is thrown upward with such a velo...

A ball is thrown upward with such a velocity v that it returns to the thrower after 3 s. Take g = 10 `ms^(-2)`. Find the value of v :-

A

15 m/s

B

20 m/s

C

10 m/s

D

5 m/s

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A
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(a) A ball is thrown vertically upward with speed 10 m//s and it returns to the ground with speed 8 m//s . Find the maximum height attained by the ball. (b) A ball is thrown vertically upward and if air resistance is half of weight of the ball, find the ratio of time of ascent and time of descent. (C) Two balls A and B (m_(A) = 2 m_(B) = 2 m) are thrown vertically upward. If air resistance is mg//2 , find ratio of maximum height attained by them.

Knowledge Check

  • A ball is upward with such a velocity v that it returns to the thrower after after 3 s . Take g = 10 ms^-2 . Find the value of v .

    A
    15 m//s
    B
    20 m//s
    C
    10 m//s
    D
    5 m//s

  • If a ball is thrown vertically upwards with a velocity of 40m//s , then velocity of the ball after 2s will be (g = 10m//s^(2))

    A
    `15m//s`
    B
    `20 m//s`
    C
    `25m//s`
    D
    `28 m//s`

  • A ball is thrown vertically upwards with a velocity of 10 ms^(-1) . It returns to the ground with a velocity of 9 ms^(-1) . If g=9.8 ms^(-2) , then the maximum height attained by the ball is nearly (assume air resistance to be uniform)

    A
    5.1 m
    B
    4.1 m
    C
    4.61 m
    D
    5 m

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