Question

Suppose an empty grocery cart rolls downhill in a parking lot. The cart has a maximum soeed of 1.3 m/s when it hits the side of the store and comes to rest .3 seconds later. If an unbalanced force of -65 N stops the cart, what is the mass of the grocery cart?

Answer 1

I know F=ma, and -65 N = ma, but I honestly cant get farther than there.

Answer 2

Okay so im going to just assume some things, like the cart actually went into the store after crashing thru the window or something

Answer 3

Most likely

Answer 4

so 1.3 m/s must come to a stop in 0.3 seconds

Answer 5

-1.3/.3 ?

Answer 6

so what was the acceleration

Answer 7

0-1.3
______
.3

Answer 8

- 4 1/3

Answer 9

okay so we know this acceleration is the result of -65 N

Answer 10

THATS WHAT I WAS MISSING THANK YOU. I DIVIDE -65 BY -4 1/3 AND THAT'S THE ANSWER RIGHT?

Answer 11

yeah

Answer 12

15 KG?

Answer 13

yeaah

Answer 14

YES! Thank you sO MUCH!!!!

Answer 15

sure thing :)

Answer 16

also i want you to be a little careful about some assumption we made here

Answer 17

?

Answer 18

you know how u did 1.3/0.3 for the acceleration component

Answer 19

Yes?

Answer 20

Well, -1.3/.3

Answer 21

this is we are assuming this qeuation is true
A = (Vf-Vi)/t

Answer 22

When wouldn't it be?

Answer 23

This is an equation that models linear acceleration this is actually known as avg acc it is not generally the real acc

Answer 24

Oh my

Answer 25

we dont know the kind of collisio0n that really happened and the differen ways the acceleration behaved like for example the acc could be high and all of a sudden low but in the end still ended up stopping in 0.3 secons multiple behavior of acc can lead to it stopping in 0.3 secs

Answer 26

just something to keep in mine, that different behavior of accleration is going to be seen in different velocities and different distances the cart travelled

Answer 27

I'm in 8th grade physics right now haha, so it's probably the linear one for now.

Answer 28

in mind*

Answer 29

okay but its okay!! since it just says its an unbalanced forced of -65 N, this means it was really linear

Answer 30

its good you are doing this in grade 8 then, u will have lots of time to think about this stuff :)

Answer 31

Ok, that sounds good! I really like bio, and i dont really like physics that much, so im not that excited haha

Answer 32

oh okay i see then nvm

Answer 33

I love dissections and bio in general

Answer 34

But yea. Thank you so much!

Answer 35

sure thing :)

Answer 36

:)

Answer 37

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Answer 38

Dannggg

Answer 39

hehe ty

Answer 40

*now wants to be a qualified helper haha*

Answer 41

No problemo haha

Answer 42

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Answer 43

yeeettt

Answer 44

oh ( ; - ; )

Answer 45

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Answer 46

yeah u can buy some titles

Answer 47

How?

Answer 48

u need 50 first though

Answer 49

you can find titles in your profile

Answer 50

Dangit. How do I get more cents haha?

Answer 51

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Answer 52

oh dang. that's cool

Answer 53

jut answer some ppls questions

Answer 54

or make a picture on some post lol that usually works

Answer 55

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Answer 56

lol

Answer 57

lol