Practice!

Sample Problem

After finals, Jason throws his physics textbook horizontally off a 300. meter cliff at 15.0 m/s. How far will Jason’s book travel horizontally in 3.00 seconds?

Use significant figures and estimate g to be -9.81 m/s².

meters

Solution

Use the formula dy = v0y t + 1/2 at2 and this time solve for distance. Since the ball does not accelerate horizontally (g acts in the vertical direction) , acceleration is zero.

We are given that t = 3.00s, and we can plug these numbers in for the variables to

get x = (15.0) (3.00) + 0 = 45.0m