Phy 231
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A ball is tossed upward at 15 meters / second from a height of 12 meters above the ground. Assume a uniform downward acceleration of 10 m/s^2 (an approximation within 2% of the 9.8 m/s^2 acceleration of gravity).
• How high does it rise and how long does it take to get to its highest point?
• How fast is it then going when it hits the ground, and how long after the initial toss does it first strike the ground?
• At what clock time(s) will the speed of the ball be 5 meters / second?
• At what clock time(s) will the ball be 20 meters above the ground?
• How high will it be at the end of the sixth second?
answer/question/discussion: ->->->->->->->->->->->-> :
It takes 1.5 seconds to get to its highest point. Its highest point is 26.25 meters above the ground.
The object strikes the ground at 3.8 seconds and it is going at -23 m/s at this point.
It will be going 5 m/s at t= 1 second.
The ball will be 20 meters above the ground at t = 3.3 seconds.
At the end of the sixth second, it will be at ground level.
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20 minutes
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&#Good responses. Let me know if you have questions. &#