a cannonball is fired with a speed of 76 m/s from the top of a cliff. It strikes the plane below with a speed of 89 m/s. if we neglect air f

Question

a cannonball is fired with a speed of 76 m/s from the top of a cliff. It strikes the plane below with a speed of 89 m/s. if we neglect air friction, how high is the cliff

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Lệ Thu 6 months 2021-08-07T12:29:37+00:00 1 Answers 2 views 0

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    2021-08-07T12:31:11+00:00

    Answer:

    we use the formula,

    v {}^{2}  = u {}^{2}  + 2gh

    89 {}^{2}  = 76 {}^{2}  + 2(10)h

    h = (89 {}^{2}  - 76 {}^{2} ) \div 20

    h= 107 m

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