Explore BrainMass
Share

Explore BrainMass

    Projectile motion-initial speed

    This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here!

    A soccer player kicks a rock horizontally off a 40.0m high cliff into a pool of water. If the player hears the sound of the splash 3.00s later, what was the initial speed given to the rock? Assume the speed of sound in air to be 343m/s

    © BrainMass Inc. brainmass.com April 3, 2020, 1:41 pm ad1c9bdddf
    https://brainmass.com/physics/velocity/projectile-motion-determining-initial-speed-8220

    Solution Preview

    See attached file for sketch

    We take the origin to be the top of the cliff.

    y increases as we move down the cliff

    The rock is hit with a velocity V in the horizontal direction

    This velocity has no component in the y direction

    x = V *t (since there is no acceleration in the x direction)

    y=ut+1/2 a t ...

    Solution Summary

    The solution calculates initial speed for projectile motion.

    $2.19

    ADVERTISEMENT