## Newton’s Second Law of Motion: Concept of a System| Dynamics: Force and Newton’s Laws of Motion| College Physics| Openstax| Problem 1

A 63.0-kg sprinter starts a race with an acceleration of 4.20 m/s^2 . What is the net external force on him?

## Vector Addition and Subtraction| Two-Dimensional Kinematics| College Physics| Openstax| Problem 3.1|

Find the following for path A in Figure 3.54:           (a) The total distance traveled, and           (b) The magnitude and direction of the displacement from start to finish.

## Falling Objects| College Physics| Openstax| Problem 2.48|

A very strong, but inept, shot putter puts the shot straight up vertically with an initial velocity of 11.0 m/s. How long does he have to get out of the way if the shot was released at a height of 2.20 m, and he is 1.80 m tall?

## Falling Objects| College Physics| Openstax| Problem 2.47|

A swimmer bounces straight up from a diving board and falls feet first into a pool. She starts with a velocity of 4.00 m/s, and her takeoff point is 1.80 m above the pool. (a) How long are her feet in the air? (b) What is her highest point above the board? (c) What is her velocity when her feet hit the water?

## Falling Objects| College Physics| Openstax| Problem 2.46|

A swimmer bounces straight up from a diving board and falls feet first into a pool. She starts with a velocity of 4.00 m/s, and her takeoff point is 1.80 m above the pool. (a) How long are her feet in the air? (b) What is her highest point above the board? (c) What is her velocity when her feet hit the water?

## Falling Objects| College Physics| Openstax| Problem 2.45|

A dolphin in an aquatic show jumps straight up out of the water at a velocity of 13.0 m/s. (a) List the knowns in this problem. (b) How high does his body rise above the water? To solve this part, first note that the final velocity is now a known and identify its value. Then identify the unknown, and discuss how you chose the appropriate equation to solve for it. After choosing the equation, show your steps in solving for the unknown, checking units, and discuss whether the answer is reasonable. (c) How long is the dolphin in the air? Neglect any effects due to his size or orientation.

## Falling Objects| College Physics| Openstax| Problem 2.44|

A rescue helicopter is hovering over a person whose boat has sunk. One of the rescuers throws a life preserver straight down to the victim with an initial velocity of 1.40 m/s and observes that it takes 1.8 s to reach the water. (a) List the knowns in this problem. (b) How high above the water was the preserver released? Note that the downdraft of the helicopter reduces the effects of air resistance on the falling life preserver, so that an acceleration equal to that of gravity is reasonable.

## Falling Objects| College Physics| Openstax| Problem 2.43|

A basketball referee tosses the ball straight up for the starting tip-off. At what velocity must a basketball player leave the ground to rise 1.25 m above the floor in an attempt to get the ball?

## Falling Objects| College Physics| Openstax| Problem 2.42|

Calculate the displacement and velocity at times of (a) 0.500, (b) 1.00, (c) 1.50, (d) 2.00, and (e) 2.50 s for a rock thrown straight down with an initial velocity of 14.0 m/s from the Verrazano Narrows Bridge in New York City. The roadway of this bridge is 70.0 m above the water.

## Falling Objects| College Physics| Openstax| Problem 2.41|

Calculate the displacement and velocity at times of (a) 0.500, (b) 1.00, (c) 1.50, and (d) 2.00 s for a ball thrown straight up with an initial velocity of 15.0 m/s.