1. An engine expands 40.0 hp in propelling a car along a level tract at a constant speed of 15.0 m/s. How large is the total retarding force acting on the car?

A. 2.67 N

B. 2250 N

C. 2520 N

D. 26.7 N

2. 133. A car of mass 1000.0 kg moving at 20.0 m/s collides with a 5000.0 kg truck at the initial velocity of 10.0 m/s. After the collision, the car stops. Neglecting friction, what is the velocity of the truck after the collision? A. 8.0 m/s B. 14 m/s C. 10.0 m/s

3. A ball is thrown into the air at an angle of 36 degrees above the horizontal with an initial velocity of 45 m/s from a 65-m-high building. How fast does the ball travel upward initially?

A. 26 m/s

B. 46 m/s

C. 16 m/s

C. 36 m/s

4. Assume the coefficient of kinetic friction between a 22 kg box and a rough floor is 0.25. what horizontal force is needed for the box to move at a constant speed?

A. 53 N

B. 55 N

C. 45 N

D. 54 N

5. 96. A baseball player does 1234 Joules of work when hitting a baseball into field with an angle of 11 degrees with respect to the horizontal. The baseball reached 134 meters away. Calculate the force used to hit the ball. a. 9.5 N b. 9.4 N c. 9.3 N

6. A 20.0 kg crate is initially at rest on a surface. A force of 75 N sets the crate in motion. After moving, a 60.0 N force is required to keep it moving with a constant speed. What is the static coefficient of friction between the crate and the surface?

A. 0.38

B. 0.27

C. 0.33

D. 0.31