Question

Help?? :/

A 1150 Kg wrecking ball is lifted to a height 13.0 meters above its resting point. What is the potential energy of the wrecking ball at this height?

146510 J
14950 J
127.4 J

Answer 1

potential energy = mass * height * gravity constant

Answer 2

So then would it be B: 14950 J?

Answer 3

1150 kg * 13 meters * 9.8 meter/s^2 =

Answer 4

Ohhh ok. So it'd actually be A?

Answer 5

41 veiwing

Answer 6

I know, what the heck is that about??

Answer 7

idk?

Answer 8

@perl

Answer 9

ahahah

Answer 10

Potential energy is mgh

Answer 11

XD

Answer 12

\[U = mgh\]

Answer 13

Just realized perl said it earlier

Answer 14

So.. its 146510 J?

Answer 15

Looks good

Answer 16

Joules has units of kg m^2/s^2 , and your solution does :)

Answer 17

Yay! Thank you!! Mind helping with another one? Whats the formula for Kinetic Energy? Its the same question, I just have to find KE.

Answer 18

\[K = 1/2 mv^2\]

Answer 19

Hm. I keep getting 97175...

Answer 20

who what where when why how

Answer 21

I took v^2 which i assumed was 13^2 and i multiplied 0.5 * 1150 * 169 and got 97175

Answer 22

v = velocity, why would the height be the velocity, which is measured in m/s :P

Answer 23

Oh thats right. I got ahead of myself. Ok let me re-work that... Ugh. im just gonna take a guess. Is it 14950 J?

Answer 24

You're given the same options for KE?

Answer 25

Yes.

Answer 26

Alright, ever heard of conservation of energy?

Answer 27

Yes. Dont know too much about it tho...

Answer 28

PE = mgh

Answer 29

You can set the equations equal to each other and solve for v and then plug back into KE and solve for KE

Answer 30

You'll get an interesting answer, that will follow conservation of energy!