### Home > CALC > Chapter 12 > Lesson 12.1.3 > Problem 12-39

12-39.

A ball is thrown from a window 25 meters above the ground with an initial velocity of 40 meters per second and an angle of inclination of

. Let the origin be the point on the (level) ground below the window. Homework Help ✎ Assume the acceleration due to gravity is −10

. Find *x*(*t*) and*y*(*t*).Find the angle at which the ball hits the ground.

First, determine when the ball hits the ground. This is when *y*(*t*) = 0.

Then angle is the angle created by the slope.

Think of drawing a slope triangle and calculating the angle.