Asked by Patrick

a ball is thrown vertically upward from the ground with the velocity of 30m/s. a) how long will it take to rise to its highest poitn? b) how high does the ball rise? c) how long after projection will the ball have a velocity of 10m/s? d) what is the total time of flight?
Answered by tchrwill
a ball is thrown vertically upward from the ground with the velocity of 30m/s. a) how long will it take to rise to its highest poitn? b) how high does the ball rise? c) how long after projection will the ball have a velocity of 10m/s? d) what is the total time of flight?

From Vf = Vo - gt, 0 = 30 - 9.8t yielding t = 3.06 sec.

From h = Vo(t) - g(t^2)/2, h = 30(3.06) - 4.9(3.06)^2 yielding h = 45.88m.

From Vn = Vo - gt, 20 - 9.8t yielding t = 2.04 sec.

Since the fall time equals the rise time, the total flight time is 2(3.06) = 6.12 sec.
Answered by bfreeman
How do we handle something without a symetrical rise/fall time. An object thrown vertically from a window is the basis of this question
Answered by Brylle
a ball is thrown vertically upward from the ground with the velocity of 30m/s. a) how long will it take to rise to its highest point? b) how high does the ball rise? c) how long after projection will the ball have a velocity of 10m/s upward? d)of 10 m/s downward? e) what is the displacement of the ball zero?
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