Tuesday
May 21, 2013

# Homework Help: precalculus

Posted by Mary on Friday, November 21, 2008 at 5:25am.

Darius serves a volleyball with an initial velocity of 34 feet per second 4 feet above the ground at an angle of 35 degrees.
1). What is the maximum height, reached after about 0.61 seconds?

2)After how many seconds will the ball hit the ground if it landed 39 feet away and it is not to be returned.

• precalculus - drwls, Friday, November 21, 2008 at 7:22am

1. From the information about angle and initial velocity, the time 0.61 s could have been predicted. The additional upward distance it travels in that time equals the average upward velocity time 0.61 s. 4 m must be added to that for the height above ground.
Total height then is
(1/2)(34 ft/s)*sin 35*(0.61s) + 4m = 9.94 ft

2. Add the time to fall 9.94 ft,
sqrt[2*9.94ft/g], to 0.61 s. You do not need to use the fact that it travels 39 feet horizontally. That could have been predicted.

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