The 23 kg girl in the swing at (A) is at a height of 0.80 m above position (B). What is the speed of the girl at B?

A ball is launched directly upwards from the ground. At max height, the ball has a gravitational potential energy of 200 J. If the ball the ball has a mass of 4 kg, then what was the initial velocity of the ball? Report your answer in units of meters per second (m/s) but only write down the number part.

A ball of mass m= 0.38 kg is tied to a massless string of length L=1.2m. The ball is released at rest from point A as shown in the figure. a) What is the speed of the ball as it passes through point B? b) What is the tension in the string at point B? 35 1.2 m A

An obnoxious brat assigns his 0.0217-kilogram pet mouse Mickey the role of stunt mouse by stuffing him into a spring gun and shooting him up into the air at some angle. During the launch process the spring transfers 0.713J of energy into the 'mouse+Earth+gravitational fields' system. Becasue he is fired at an angle, when Mickey reaches his maximum height, he is still moving horizontally with a speed of 2.29 m/s. How high above his initial location in the gun does Mickey soar? (In case you are worried, a miniature parachute opens at this point and Mickey lands safely. The brat is slightly less obnoxious than we thought.) Take g = 9.81 m/s?. Number

My 25-kilogram garbage cart has a broken wheel. I pull it to the curb with a force of 200N, while kinetic friction drags backwards with a force of 150N. Starting at rest, how fast is the cart moving after travelling two meters?

7. The kinetic energy of a mass m moving from x = 0 to x =d is given by K(x) = Ko (2-). Find the force acting on the mass, and the time that the mass moves from x = 0 to x = d.

A 0.54 kg toy car is loaded into a spring launcher that is compressed 2 cm. The spring has a spring constant of 860 N/m. What was its initial velocity when it was released by the spring, in m/s?

A proton (mass m = 1.67 × 10-27 kg) is being accelerated along a straight line at 9.80 × 101¹1 m/s² in a machine. If the proton has an initial speed of 5.40 × 104 m/s and travels 3.80 cm, what then is (a) its speed and (b) the increase in its kinetic energy?

In 1949, an automobile manufacturing company introduced a sports car (the "Model A") which could accelerate from 0 to speed v in a time interval of At. In order to boost sales, a year later they introduced a more powerful engine (the "Model B") which could accelerate the car from 0 to speed 2.37v in the same time interval. Introducing the new engine did not change the mass of the car. Compare the power of the two cars, if we assume all the energy coming from the engine appears as kinetic energy of the car. PB РА

A 0.15 kg ball is dropped. How fast will it be moving after it has fallen 1.5 meters? (Note – there is no spring or similar material in this problem i