1. Explain your answers to the following: a. Can the velocity change without changing the acceleration? b. Can the kinetic energy be constant if an object is accelerating? c. Can the momentum change without changing the kinetic energy?

QUESTION 11 Starting from rest, a ball of mass 3 kg experiences a constant force of 9 N. What is the final kinetic energy (in J) of the ball after it has traveled a distance of 8 m? A. 216J B, 72J C.3J D. 24J E, 27J

An object with mass m and a velocity v. What happens to Kinetic Energy when velocity is doubled? a. stays the same  b. quadrupled  c. halved d. doubled e. not enough info

Activity 2 – Kinetic Energy Solve the following problems with complete solutions. 1. Calculate the speed of an 8.0 × 10* kg airliner with a kinetic energy of 1.1 × 10° J. 2. What is the speed of a 0.145 kg baseball if its kinetic energy is 109 J? 3. Two bullets have masses of 3.0 g and 6.0 g, respectively. Both are fired with a speed of 40.0 m/s. Which bullet has more kinetic energy? What is the ratio of their kinetic energies?

3. Which of the following statements correctly describes the relationship between an objects kinetic energy and its speed? a. E k is directly proportional to the speed of the object b. E k is directly proportional to the speed squared of the object c. E k is inversely proportional to the speed of the object d. E k is inversely proportional to the speed squared of the object e. none of the above describe the relationship

I need help with these questions

A hand pushes a 3 kg block along a table from point A to point C as shown in the figure below. The table has been prepared so that the left half of the table (from A to B) is frictionless. The right half (from B to C) has a non-zero coefficient of friction equal to µ. The hand pushes the block the full distance from A to C using a constant force of 5 N. The block starts off at rest at point A and comes to a stop when it reaches point C. The distance from A to B is 0.5 m and the distance from B to C is also 0.5 m. We will consider the block by itself as our system so all forces on the block are external. Initial position of block Final position ofblock P no friction friction A B C -1½ m 1½ m

A 1.0 kg cart is sliding to the right on a frictionless surface with speed 2 m/s. It collides head-on and sticks to a 0.5 kg cart that is sliding to the left with speed 4 m/s. What is the kinetic energy of the combined carts after the collision? (Hint: Make a table!) A.6 J B.0 J C.2 J D.4 J

2. How much force is required to move a box 25 m using 689 J of energy? A. 0.036 N B. 28 N C. 17000 N D. 660 N

036. A 1.50 kg model train initially traveling at 0.50 m/s acceler- ates to 1.00 m/s in 10. s. a. What is the change in the train's kinetic energy? b. How much power was expended to accelerate the train?