A ball is thrown horizontally from a height of 17.7 m and hits the ground with a speed that is 3.00 times its initial speed. What is the speed in the vertical direction just before the ball hits the ground

19.76 m/s

Explanation:

Let v be the speed just before the ball hits the ground. The v/3 is the initial speed. When the ball falls to the ground its potential energy is converted to kinetic energy: where m is the mass and h = 17.7 is the vertical distance traveled, is the initial velocity , and g = 9.81 m/s2 is the gravitational acceleration. We can divide both sides by m:

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2

im srry but ur wrong the answer is d a smooth rock, some red dirt, and an empty bird's nest.