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gifty91

  • 2 years ago

A boy is practicing tennis by hitting a ball at a wall. He hits the ball at 0.75 m above the ground. The initial speed of the ball is 20.0 m/s at an angle of 32 degrees above the horizontal. How long does it take for the ball to hit the wall if it is 6.7 m away?

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  1. imron07
    • 2 years ago
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    You can use these two equation: \[y=y_0 +v_0\sin{\alpha}-\frac12 g t^2\] and \[x=v_0 \cos{\alpha}*t\] That's all you need

  2. gifty91
    • 2 years ago
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    Can I use either equation to get the answer or do I have to use both somehow?

  3. imron07
    • 2 years ago
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    You have to use both, you might like to find t from second equation first, then substitute to first equation.

  4. gifty91
    • 2 years ago
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    Ok, I got an answer for t, but I don't understand why I need to plug in that figure to the first equation since I've already found time.

  5. imron07
    • 2 years ago
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    Good, of course you don't need to. This problem's just overresource. Sorry for my previous answer, i'm not concentrating back then :)

  6. gifty91
    • 2 years ago
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    Lol.. that's ok. :) Thanks for your help!

  7. imron07
    • 2 years ago
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    Theheh, welcome.

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