Two balls of equal size are dropped from the same height from the roof of a building. One ball has twice the mass of the other. When the balls reach the ground, how do the kinetic energies of the two balls compare? The lighter one has one-fourth as much kinetic energy as the other does. The lighter one has one half as much kinetic energy as the other does. The lighter one has the same kinetic energy as the other does. The lighter one has twice as much kinetic energy as the other does.

One car has 3 times the mass of a second car, but only 1/5 times the kinetic energy of the second. When both cars increase their speed by 15.3 m/s they then have the same kinetic energy. What was the original speed of the first car? (Your result must be in units of m/s and include 2 digit after the decimal point. Maximum of 5% of error is accepted in your answer.)

ks Classes A4 A 2 kg object moves with a velocity of 4 m/s for a time of 10 seconds. How much KE does the object possess? 1 Ex = -_-mv² 2 E = kinetic energy of object m = mass of object v= speed of object 16 w 16 J 8 J 8 W ch F2 #3 3 F3 $ 4 Y F4 II F5 % 5 F6 A 6 DELL F7 & 7 8 F8 * CO F9 prt sc 9 F10

A 0.60-kg block initially at rest on a frictionless, horizontal surface is acted upon by a force of 5.0 N for a distance of 5.0 m. How much farther would the force have to act for the block to have 64 J of kinetic energy?

Which has more kinetic energy: a 0.0012-kg bullet traveling at 395 m/s or a 6.0  107-kg ocean liner traveling at 13 m/s (25 knots)? the bullet has greater kinetic energy or the ocean liner has greater kinetic energy       Ek-bullet  =   ______Joules Ek-ocean liner  =  ________ Joules

"Two stones, one of mass m and the other of mass 2m, are thrown directly upward with the same velocity at the same time from ground level and feel no air resistance. Which statement about these stones is true?"     The heavier stone will go twice as high as the lighter one because it initially had twice as much kinetic energy.     Both stones will reach the same height because they initially had the same amount of kinetic energy.     "At their highest point, both stones will have the same gravitational potential energy because they reach the same height."     "At its highest point, the heavier stone will have twice as much gravitational potential energy as the lighter one because it is twice as heavy."

A couple of soccer balls of equal mass are kicked off the ground at the same speed but at different angles. Soccer ball A is kicked off at an angle slightly above the horizontal, whereas ball B is kicked slightly below the vertical. How do each of the following compare for ball A and ball B? (a) The initial kinetic energy and (b) the change in gravitational potential energy from the ground to the highest point? If the energy in part (a) differs from part (b), explain why there is a difference between the two energies.

Two cars are moving. The first car has twice the mass of the second car, but only half as much kinetic energy. Then, both cars increase their speed by 8.00 m/s. They then have the same kinetic energy. The original speeds of the two cars are, respectively, 22.6 m/s, v2 = 11.3 m/s. (A) V1 = 5.66 m/s, v2 = 11.3 m/s. V1 = 14.1 m/s, v2 = 7.07 m/s. V1 = 11.3 m/s, v2 = 5.66 m/s.

Rank the following items in order of INCREASING (low to high) kinetic energy. Provide an explanation for the ranking. v=2m/s v=0m/s v=4m/s v=3m/s m=10 kg m=20kg m=5kg m=8kg Object A Object B Object C Object D

Galileo does an experiment. He goes to the top of the leaning tower of pisa and drops a concrete ball and a wooden ball of equal size.The concrete ball has twice the mass of the wooden ball. How do the kinetic energies of the balls compare as they reach the ground? a) The wooden one has four times as much kinetic energy as the other does. b) The wooden one has twice as much kinetic energy as the other does. c) The wooden one has the same kinetic energy as the other does. O d) The wooden one has one fourth as much kinetic energy as the other does. O e) The wooden one has one half as much kinetic energy as the other does. (