anonymous 4 years ago A ballplayer catches a ball 3.0s after throwing it vertically upward. With what speed did he throw it, and what height did it reach? Answer: 15 m/s and 11m

1. anonymous

the anwer is wrong. :/

2. TuringTest

The numbers are approximate, but not totally wrong. At the top v=0 and the time past will be half the total time given, so we have$v=v_i-gt=0\to v_i=gt\approx10(1.5)=15m/s$we can use a kinematic to find the height$s=v_it-\frac12gt^2\approx15(1.5)-10(1.5)^2\frac12\approx11$