Question

Two equal mass balls (one red and the other blue) are dropped from the same height and rebound off the floor. The red ball rebounds to a higher position than the blue ball. Neglect air resistance. Which, if any, of the following statements is/are true?

Answer 1

During the collision with the floor, both balls transfer the same amount of momentum to the floor.
Except for the instant they are in contact with the floor, both balls are in free fall.
If air resistance is NOT ignored, then the sum of the kinetic and potential energies of the ball decreases as the ball falls.
Once they come to a stop in the air after bouncing off the floor, the red ball has a greater amount of gravitational potential energy.
During the entire process, some mechanical energy is converted into thermal energy.

Answer 2

last one is true!

Answer 3

the second last one also true :D

Answer 4

yep. I said false false true true true and got it wrong

Answer 5

er i mean i said true false true true true

Answer 6

wait.. first one is also true

Answer 7

wait there are only 4 options.. and you gave five answers.. !

Answer 8

Sorry there are 5 different options but they are poorly spaced out

Answer 9

During the collision with the floor, both balls transfer the same amount of momentum to the floor.

Except for the instant they are in contact with the floor, both balls are in free fall.

If air resistance is NOT ignored, then the sum of the kinetic and potential energies of the ball decreases as the ball falls.

Once they come to a stop in the air after bouncing off the floor, the red ball has a greater amount of gravitational potential energy.

During the entire process, some mechanical energy is converted into thermal energy.

Answer 10

Hope thats better

Answer 11

yea yea.. sorry.. i feel except for the air resistance thing, all others are true!!

Answer 12

infact.. all are true? :O

Answer 13

But the balls arent in free fall after the bounce

Answer 14

they are in free fall BEFORE contact!!.. so its a true

Answer 15

I know that...but doesnt the question also apply for after the bounce? making it not in free fall after?

Answer 16

i doubt.. cause.. after rebound.. it reaches some height and again experience free fall :D

Answer 17

1true
2 true
3 true
4 false
5 true

Answer 18

Why would 4 be false? the red ball is higher...so greater PE...

Answer 19

why is 4 false sir??.. red ball is higher.. so greater PE

Answer 20

lol

Answer 21

OMG.. YOU are reading my mind!!!!!!

Answer 22

PE is inversily proportional to distance

Answer 23

ramkrishna.. what crap? :P

Answer 24

not really... PE = mgh

Answer 25

so i guess all true then?

Answer 26

yea i think so.. all true! ..sorry was watching pirates of carribean :D for te nth time!