a tennis ball mashine fires aball vertically upward at time t=0 at 19.6 m/s assume the air resistance is negligible and take g=9.8m/s^ calculate the displacement and velocity of the ball at t=1.0s,2.0s,3.0s and 4.0s

See the answers below.

Explanation:

To solve this problem we must use the following equation of kinematics.

where:

y = final elevation [m]

yo = initial elevation = 0

vo = initial velocity = 19.6 [m/s]

t = time required [s]

g = gravity acceleration = 9.81 [m/s²]

Now we can replace the different times in the equation above.

For  t = 1 [s]

For  t = 2 [s]

For  t = 3 [s]

For  t = 4 [s]

We can see that the sign of gravitational acceleration is negative, since it points in the opposite direction to the motion of the launch.

Note when the time is equal to 4 seconds we see that the distance is 0, ie the tennis ball has reached its maximum height and begins to descend.

the answer is kevlar

grav potential energy