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18 May, 19:59

A projectile travels in the horizontal direction at a velocity of 200.0 meters/second from a cliff that is 200.0 meters high. After how many seconds will the projectile reach the ground level?

A. 4.2 seconds B. 6.2 seconds C. 6.4 seconds D. 9.2 seconds

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  1. 18 May, 20:25
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    Option (c) is correct. The projectile will reach the ground after a time of 6.4 seconds.

    Explanation:

    Height of cliff = 200 m

    initial velocity along vertical=0

    initial velocity of horizontal=200 m/s

    we use the kinematic equation;

    h = Vit + 1/2 gt²

    200=0 (t) + 1/2 (9.8) t²

    4.9t²=200

    t²=40.82

    t=6.4 seconds
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