Question

Object A has of mass 7.20 kilograms, and object B has a mass of 5.75 kilograms. The two objects move along a straight line toward each other with velocities +2.00 meters/second and -1.30 meters/second respectively. What is the total kinetic energy of the objects after the collision, if the collision is perfectly elastic

Answer 1

uhhhhhh..

Answer 2

ikr i dont understand

Answer 3

m1=7.20kg and m2=5.75kg v1=2m/s and v2=-1.3 that's all is given

Answer 4

that is prety long Q you have to find 1st V1' and V2' through their formulas then use the relation of K.E at start and in the end ....

Answer 5

If the collision is elastic then the KE after is equal to KE before

KE = 0.5mv^2

Answer 6

my answers are in joules

Answer 7

science?

Answer 8

physics

Answer 9

yes - Joules is the unit of energy

if mass is in kg amd v in m/s then 0.5mv^2 is in joules

Answer 10

you DO know the formula for Kinetic Energy?

Answer 11

I mean what is the answer .???

Answer 12

i have no clue

Answer 13

I have told you how to work out the answer

Work out the KE of both masses before the collision

it is the same total after the collision

Answer 14

yes I know I am asking that is there any short cut to solve it in minimum time that's what is iwant....

Answer 15

50.8 was the right answer on the test question and i chose that one

Answer 16

yes - the short cut to getting it in the minimum time is to do it yourself using the formula I gave you above.

OR you can wait until someone breaks the code of conduct, and does you the DISSERVICE of posting the answer here

Answer 17

no I can do that thx...

Answer 18

is 50.8 the answer to ALL questions? It doesn't seem right to me for this one
Taking someone's answer with no explanation is a dangerous thing here - MANY answers here are just plain wrong

Answer 19

idk but thats what the computer said