A ball is thrown downward with an initial velocity of $12 \mathrm{~m} / \mathrm{s}$. Using the approximate value of $g=10 \mathrm{~m} / \mathrm{s}^2$, what is the velocity of the ball $1.0$ seconds after it is released?

A steel ball is dropped from a diving platform (with an initial velocity of zero). Using the approximate value of $g=10 \mathrm{~m} / \mathrm{s}^2$ a. What is the velocity of the ball 0.8 seconds after its release?

A steel ball is dropped from a diving platform (with an initial velocity of zero). Using the approximate value of $g=10 \mathrm{~m} / \mathrm{s}^2$ a. What is the velocity of the ball 0.8 seconds after its release?

A swimmer pushing off from the wall of a pool exerts a force of $1 \mathrm{~N}$ on the wall. What is the reaction force of the wall on the swimmer?

A $0 \mathrm{~N}$

B $1 \mathrm{~N}$

C $2 \mathrm{~N}$

D $10 \mathrm{~N}$

If a 70-kg swimmer pushes off a pool wall with a force of 250 N, what is her acceleration?

An upward force of 18 N is applied via a string to lift a ball with a mass of 1.5 kg.

What is the net force acting upon the ball?

A moving tablecloth applies a force of kinetic friction of  $0.18 \mathrm{~N}$to a dish with a mass of $0.3 \mathrm{~kg}$ for a duration of  $0.2 \mathrm{~s}$. a. What is the dish's acceleration? b. What speed does it reach in this period of time after coming to rest? c. How far does the dish move at this period (in $\mathrm{cm}$)?

A person in a hurry averages $62 \mathrm{MPH}$ on a trip covering a distance of 300 miles. What time was required to travel that distance?

For either of the trajectories shown in the diagram for question , is the velocity of the ball equal to zero at the high point in the trajectory? Explain.

In the diagram, two different trajectories are shown for a ball thrown by a center fielder to home plate in a baseball game. Which of the two trajectories (if either), the higher one or the lower one, will result in a longer time for the ball to reach home plate? Explain.

An expert marksman aims a high-speed rifle directly at the center of a nearby target. Assuming that the rifle sight has been accurately adjusted for more distant targets, will the bullet hit the near target above or below the center? Explain.

A ball rolling rapidly along a tabletop rolls off the edge and falls to the floor. At the exact instant that the first ball rolls off the edge, a second ball is dropped from the same height. Which ball, if either, reaches the floor first? Explain.

A ball thrown straight upward moves initially with a decreasing upward velocity. What are the directions of the velocity and acceleration vectors during this part of the motion? Does the acceleration decrease also? Explain.

A rock is dropped from the top of a diving platform into the swimming pool below. Will the distance traveled by the rock in a $0.1$-second interval near the top of its flight be the same as the distance covered in a $0.1$-second interval just hefore it hits the water? Explain