Question

You throw a ball straight up with an initial velocity of 15.0 m/s. It passes a tree branch on the way up at a height of 7.00 m. How much additional time will pass before the ball passes the tree branch on the way back down?

$1.91 \textrm{ s}$

Solution Video

# OpenStax College Physics Solution, Chapter 2, Problem 49 (Problems & Exercises) (4:06)

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Video Transcript

Submitted by tyler707 on Mon, 09/16/2019 - 16:56

How come the - sign was left off of the 4.9 in the -4ac in the quadratic equation. When the a equals -4.9 not 4.9?

Submitted by ShaunDychko on Fri, 09/20/2019 - 09:56

Hi tyler707, thanks for the question. At 3:22 in the video I'm seeing that the negative is indeed included in the "-4ac" term. If you're still seeing something different, let me know.
All the best,
Shaun