document.write( "Question 87993: a coin is dropped from a height of 750 feet. the height,s,at time,t, is given by s=-16t^2+750.\r
\n" ); document.write( "\n" ); document.write( "a. find the average velocity on the interval[1,3]
\n" ); document.write( "b. find the instantaneous velocity when t=3
\n" ); document.write( "c. find the velocity of the coin when it hits the ground \n" ); document.write( "
Algebra.Com's Answer #63873 by stanbon(75887)\"\" \"About 
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a coin is dropped from a height of 750 feet. the height,s,at time,t, is given by s=-16t^2+750.
\n" ); document.write( "a. find the average velocity on the interval[1,3]
\n" ); document.write( "Average = [s(3)-s(1)]/[3-1}
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\n" ); document.write( "b. find the instantaneous velocity when t=3
\n" ); document.write( "Derivative = -32t
\n" ); document.write( "Instantaneous velocity at t=3 = -32(3) = -96 ft/sec
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\n" ); document.write( "c. find the velocity of the coin when it hits the ground
\n" ); document.write( "When it hits the ground s(t) = 0
\n" ); document.write( "Solve -16t^2+750 = 0
\n" ); document.write( "t^2 = 750/16
\n" ); document.write( "t = 6.847 seconds
\n" ); document.write( "Velocity at t=6.847 sec = -32(6.847)= -219.09 ft/sec
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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