9. The tow truck operator has forgotten to tie down Granny's car (m = 1600 kg). It starts to slide off the tilted bed and reaches a speed of 3.00 m/s after sliding for 2.00 m. At what angle (above the horizontal) was the bed tilted?

46. Roller coasters use some of the most sophisticated technology. Safety is a big part of that technology. One of the reasons roller coasters require such sophisticated safety computers is for insurance and legal purposes. During the 1920s, 30s and 40s, roller coasters had a reputation of being wild, rough and very dangerous. They pulled up to 12 Gs (about 120 m/s²), which often snapped peoples' necks! They also tended to derail and ram into each other. Modern day coasters are practically run by computers. Computers are so important for the safety of roller coasters, they make riding a coaster safer than walking across the street. Computer calculations make it possible to dip, loop and nearly scare you to death without harming you. In testing a model of a looping roller coaster, an engineer observes that the current design would result in a zero normal force acting on the passengers at the top of the loop. (a) If the radius of the loop is 4.0 m, what is the speed of the model coaster…

A 2000kg truck starts at rest and reaches a speed of 15 m/s over a time period of 5s. What is the value of the force required to do this? Express answer in Newtons.

A net (unbalanced) external force of 100.0 N acts on an object of mass 20.0 kg whose initial speed is 10.0 m/s. The force acts in the opposite direction from the object's motion, and it acts for 1.00 s. What is the object's final speed, in m/s?

8. An actor whose mass is 75 kg jumps from the platform. Determine the speed of the actor as it hits the ground 5 meters below the platform.

An constant applied force of 40.1 N lifts an 2.50 kg mass straight up, resulting in a final speed of 3.6 m/s. What distance did the mass move if it was initially at rest?

13. In which one of the following circumstances could mechanical en- ergy not possibly be conserved, even if friction and air resistance are ab- sent? (a) A car moves up a hill, its velocity continually decreasing along the way. (b) A car moves down a hill, its velocity continually increasing along the way. (c) A car moves along level ground at a constant velocity. (d) A car moves up a hill at a constant velocity.

7. An arrow of mass 0.018 kg is shot upward at an angle from the ground, reaching a maximum height of 25 m with a speed of 62 m/s. Neglecting air resistance, with what speed will the arrow hit the ground?

as a fish jump vertically out of the water, assume that only two significant forces act on it: an upward force F exerted by the tail fin and the downward force due to gravity. a force chinook salmon has a length of 1.50 m and a mass of 48.5 kg. if the fish is moving upward at 3.00 m/s as its head first breaks the surface and has an upward speed of 5.80 m/s after two-thirds of its length has left the surface, assume constant acceleration and determine the following. a. the salmon's  acceleration b. the magnitude of the force F during this interval

A force of 1.50 N acts on a 0.20-kg carts so as to uniformly accelerate it along a straight air track. The track and force are horizontal and in line. How fast is the cart going after acceleration from rest through 30 cm, if friction is negligible?