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28 February, 15:56

A small child gives a plastic frog a big push at the bottom of a slippery 2.0 meter long, 1.0 meter high ramp, starting it with a speed of 6.0 m/s. What is the frog's speed as it flies off the top of the ramp?

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  1. 28 February, 16:15
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    First, let's find the angle of inclination using the tangent function.

    sin θ = opposite/hypotenuse = 1 m/2 m

    θ = 30°

    Assuming the ramp is frictionless, the force balance is:

    F = mgsinθ = ma

    Cancelling out m,

    a = gsinθ = (9.81 m/s²) (sin 30°) = 4.905 m/s²

    Using the equation for rectilinear motion at constant acceleration,

    x = v₀t + 0.5at²

    2 m = (6 m/s) (t) + 0.5 (4.905 m/s²) (t²)

    Solving for tm

    t = 0.297 seconds

    Using the equation for acceleration:

    a = (v - v₀) / t

    4.905 m/s² = (v - 6 m/s) / 0.297 s

    Solving for v,

    v = 7.46 m/s
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