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8 June, 03:19

I have a truck traveling forward at 20 m/s and I proceed to shoot a ball horizontally backwards from the back of the truck at 20 m/s. What direction does the ball go?

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  1. 8 June, 04:09
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    Refer to the diagram shown below.

    Let the truck be traveling north at 20 m/s.

    Let the ball be shot eastward at 20 m/s

    The resultant velocity of the ball is

    v = √ (20² + 20²) = 20√2 = 28.284 m/s

    The direction is

    θ = tan⁻¹ (20/20) = tan⁻¹ 1 = 45°

    Answer:

    The ball travels at 28.3 m/s at 45° relative to the direction of the truck.
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