A 0.50 kg block slides across a tabletop with an initial velocity of 20 cm/s and comes to rest in a distance of 70cm. Find the average friction force that retarded its motion A. 0.241 N B. 0.014 N C. 0.014 J D. 0.214 J

7. You put a box on a skateboard and give it a quick push with a certain force. It starts to move. After it leaves your hand, it will... * a. Continue at a constant speed forever. O b. Slow down constantly until it stops. c. Speed up constantly forever. d. Speed up for a little while, then go at a constant speed forever. e. Speed up for a little while, go at a constant speed for a while, then slow down to a stop. sheet of oa

A 1000 kg car was travelling at 45m/s when it hit a concrete wall due to drunk driving. Find the average force of impact if the car was put to a complete stop after 0.5 seconds. *   A. 70 000 N B. 95 000 N C. 85 000 N D. 90 000 N E. 80 000 N

An 50kg volleyball player lands from a jump and tries to stop her forward motion. The normal contact force exerted by the floor on her shoes is 2000N. The friction force exerted by the floor on her shoes is 600N acting backward on the player. What is the resultant ground reaction force exerted by the floor on the volleyball player’s shoes?  s. 2088N b. 50kg c. 491N d. 2600N

Two forces are simultaneously acting on a 4.0 kg object on top of a frictionless surface. The forces are 12 N upward and 16 N to the right, yielding a net force as shown in the figure. NET FORCE. What is the magnitude of the net force F? 12 N 4.0 kg A. 5.3 N OB. 11 N OC. 20 N OD. 28 N E. 400 N 8 16 N F. net +X

A 2.5 kg block of wood moving at 3.2 m/s suddenly crosses from a frictionless surface to a surface with a kinetic coefficient of friction of 0.15. The block will come to rest after....X m

1.A 150.0g hockey puck is placed on the floor of a bus. The coefficient of kinetic friction between the puck and the floor is 0.654. How far will the puck travel in 1.50 seconds if the bus slows down at a rate of 30.0 m/s 2? Include a free body diagram including any fictional forces. The puck starts from rest.

QUESTION 6 A 4.0-kg block has an initial velocity of 10 m/s on a level floor. Because of kinetic friction between the block and the floor, it takes 2.0 s for the block to come to rest. What is the coefficient of kinetic friction between the block and the floor? a. 0.38 Ob.0.64 C. 0.25 Od. 0.77 O e. 0.51

A 20,000 kg rocket has a rocket motor that generates 3.0 x 105 N of thrust.a. What is the rocket’s initial upward acceleration?b. At an altitude of 5.0 km the rocket’s acceleration hasincreased to 6.0 m/s2. What mass of fuel has it burned?

7. A bird has a mass of 24 g and perches in the middle of a stretched telephone line. a. Show that the tension in the line can be calculated using the equation T = mg2sine. Determine the tension when b. 0 = 5° and c. e = 0.5°. Assume that each half of the line is straight.