Question

An object with a mass of 5 kg has 9kJ of kinetic energy. Calculate the velocity.

Answer 1

\[k=1/2mv^2\]
that's the formula ^^^^
can u try solving

Answer 2

so V=1/2(5)9^2?

Answer 3

yes :)

Answer 4

202.5?

Answer 5

u can round it

Answer 6

man I messed up S:

Answer 7

it's fine :) but do u see what i did?

Answer 8

You did not move the v around a k is the kinetic energy so I just screwed up my equation then you divided by 2.5 t oget to both sides then sqrt it to get v^2 to just v

Answer 9

exactly =)

Answer 10

hmm can you go over another practice problem to see if I can correct my mistake

Answer 11

sure!

Answer 12

So this is one is: A 98N object travels at 10m/s. What is the kinetic energy.

Answer 13

So K=1/2(98)(10^2)?

Answer 14

so 1/2(98)=49

Answer 15

so far so good but what about the 10^2 ?

Answer 16

100*49=4900

Answer 17

yep good job :)

Answer 18

would that be the final answer?

Answer 19

yes

Answer 20

S: There is no answer for 4900 there is an option for 490

Answer 21

:O is it 490 ki

Answer 22

I would assume it

Answer 23

we forgot to change the newton to kg

Answer 24

ohhh

Answer 25

so would that explaiin it then?

Answer 26

may be :P