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23 August, 11:48

A ball moving at positive 3.0 m per s along a table rolls off a table and lands on the ground 2.0 m away. How high was the table?

Question 3 options:

A 3.3 m

B 1.1 m

C 2.2 m

D 3.0 m

+2
Answers (1)
  1. 23 August, 12:06
    0
    consider the motion along the horizontal direction:

    v₀ = initial velocity in horizontal direction as the ball rolls off the table = 3.0 m/s

    X = horizontal displacement of the ball = 2.0 m

    a = acceleration along the horizontal direction = 0 m/s²

    t = time taken to land = ?

    using the kinematics equation

    X = v₀ t + (0.5) a t²

    2.0 = 3.0 t + (0.5) (0) t²

    t = 2/3

    consider the motion of the ball along the vertical direction

    v₀ = initial velocity in vertical direction as the ball rolls off the table = 0 m/s

    Y = vertical displacement of the ball = height of the table = h

    a = acceleration along the vertical direction = 9.8 m/s²

    t = time taken to land = 2/3

    using the kinematics equation

    Y = v₀ t + (0.5) a t²

    h = 0 t + (0.5) (9.8) (2/3) ²

    h = 2.2 m

    C 2.2 m
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