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20 September, 07:57

A rock is thrown at an angle such that the initial horizontal velocity is

15.0 m/s and the initial vertical velocity is 39.0 m/s. What is the greatest height the rock reaches?

A. 38.8 m

B. 46.9 m

C. 77.6 m

D. 98.2 m

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Answers (1)
  1. 20 September, 08:23
    0
    Option (c) is correct.

    Explanation:

    initial velocity along horizontal = Vx=15 m/s

    initial velocity along vertical = Viy=39 m/s

    final vertical velocity at the top = 0

    acceleration due to gravity=-9.8 m/s²

    using kinematic equation

    Vfy² = viy²+2gh

    0 = (39) ²+2 (-9.8) (h)

    -1521=-19.6 h

    h=77.6 m
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