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.

measure their densities same density, same sub

not too sure thinking all accelerations are pointed down