Gradebo 0/13/2017 11.55 PM 4 86.3/100 Prnt Calculator- Perodic Table estion 8 of

Question

Gradebo 0/13/2017 11.55 PM 4 86.3/100 Prnt Calculator- Perodic Table estion 8 of 15 a Sapling Learning Four objects having varied masses are initially at rest at different heights above the ground The masses and are given in the table below mass is allowed to fall to the ground and air resistance is the kinetic energy and speed with which each object hits the ground, from highest to lowest 125 689 752 562 25 0 10.3 21.9 27.1 Highest Speed #3 #2 Most Kinelic Energy #3 #2 There is a hint availablel Lowest Speed bar again to hide the hin

Explanation / Answer

the speed at the bottom is v = sqrt(2*g*h)

object 1)

speed is v = sqrt(2 * 9.8 * 25) = 22.14 m/s

kinetic energy is K.E = 1/2 * m * v^2

K.E = 1/2 * 0.125 * (22.14)^2

K.E = 30.63 J

object 2)

speed is v = sqrt(2 * 9.8 * 10.3) = 14.20 m/s

kinetic energy is K.E = 1/2 * m * v^2

K.E = 1/2 * 0.689 * (14.20)^2

K.E = 69.46 J

object 3)

speed is v = sqrt(2 * 9.8 * 21.9) = 20.72 m/s

kinetic energy is K.E = 1/2 * m * v^2

K.E = 1/2 * 0.752 * (20.72)^2

K.E = 161.42 J

object 4)

speed is v = sqrt(2 * 9.8 * 27.1) = 23.05 m/s

kinetic energy is K.E = 1/2 * m * v^2

K.E = 1/2 * 0.562 * (23.05)^2

K.E = 149.42 J

the kinetic energy from highest to lowest

3 , 4 , 2 , 1

the speed from highest to lowest is

4, 1, 3, 2

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