Ball Return
Thursday, September 2nd, 2010
How much time elapses between throwing the ball and his return to the original launch point?
A ball is thrown upward from the surface ground with an initial speed of 19.6 m / s. Not take into account the effects due to air resistance. How much time elapses between throwing the ball and return the original launch point? What maximum height is reached ball? A) B 8.00s) 12.0s C) D 16.0s) E 4.00s) 7.00s
At its highest point, is the speed is 0. The initial velocity is 19.6 m / s and the acceleration is -9.8 m / s ^ 2 (negative because it acts in the opposite direction ยบ). Puttin thses values into equation v = a + u, 0 = 19.6 – 9.8t = t> = = 2s 19.6/9.8 reurn The ball would take it to the back. Therefore the total time is 2 + 2 = 4. Hence the answer is (D). For maximum height, you can use the equation s = ut + (2.1) a ^ 2 s = 19.6 (2) + (1 / 2) (-9.8) (2 x 2) = 39.2 to 19 , 6 = 19.6 m
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