Practice!

Sample Problem

After finals, Jason throws his physics textbook horizontally off a 300. meter cliff at 15.0 m/s. It travels 7.82 seconds before it hits the ground. What is the total horizontal distance that Jason’s textbook will travel by the time it hits the ground? Use significant figures and estimate g to be 9.81 m/ s².

 

Solution

Use the formula dx = vx t and this time solve for distance.

Since the ball does not accelerate horizontally (g acts in the vertical direction) , acceleration is zero.

We know  that in the case travels = 7.82 seconds, and the initial horizontal velocity was given to us as 15 m/s,

we can plug in these values to get x = (15.0) (7.82) + 0, so x is 117.3 meters