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Two balls are dropped to the ground from...

Two balls are dropped to the ground from different heights. One ball is dropped 2 sec after the other but they both strike the ground at the same time. If the first ball takes 5 sec to reach the ground then the diffeence in initial heights is:

A

20m

B

80m

C

170m

D

40m

Text Solution

Verified by Experts

The correct Answer is:
b
`H_(1)=(1)/(2)xxgxx(5)^(2)`
`H_(2)=(1)/(2)xxg(3)^(2)`
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Knowledge Check

  • Two balls are dropped to the ground from different heights. One ball is dropped 2 s after the other but they both strike the ground at the same time. If the first ball takes 5 s to reach the ground, then the difference in initial heights is (Take "g = 10 m s"^(-2) )

    A
    20 m
    B
    80 m
    C
    170 m
    D
    40 m

  • Two balls are dropped from different heights at different instants. Seconds ball is dropped 2 sec. after the first ball. If both balls reach the ground simultaneousl after 5 sec. of dropping the first ball. then the difference of initial heights of the two balls will be :- (g=9.8m//s^(2))

    A
    58.8m
    B
    78.4m
    C
    98.0m
    D
    117.6m

  • A ball is dropped from a 10 m height ,How much time , it will take to reach the ground ?

    A
    `1.41` s
    B
    `0.58` s
    C
    `2.34` s
    D
    None of these

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