Practice!

Sample Problem

After finals, Jason throws his physics textbook horizontally off a 300. meter cliff at 15.0 m/s. After 3.00 seconds, how far will Jason’s book have fallen vertically?  Use Significant figures, and estimate g to be equal to 9.81 m/s²

Solution

Use the formula dy = v0y t + 1/2 at2and plug in all the necessary values.

v0 is zero since the book was thrown horizontally. a = g = 9.81, and t = 3.00.

Plugging in the values, we get dy = 0 + 1/2 (9.81) 9.00 = 44.1 meters.