Question

A 10.0 kg ball falling at 10.0 m/s hits a pile of feathers and comes to a complete stop in 10 s. What force does the pile of feathers exert to stop the ball?

10 N

20 N

100 N

200 N

I think the answer is 100 N

Answer 1

the formula for force is F=MA ( mass x acceleration)

Answer 2

so i did 10.0 and 10.0
but idk what to do about the 10s

Answer 3

The ball was going 10.0 m/s, and the pile of feathers slowed it to 0.0 m/s, taking 10 seconds to do so. You calculate the acceleration from that...

Answer 4

Obviously, the acceleration depends on the time, right? A car that accelerates to 60 mph in 6 seconds has more powerful acceleration than one that takes 6 minutes :-)

Answer 5

ah okay this makes it much simpler

Answer 6

use the same formula one for acceleration?

Answer 7

*or the one for acceleration

Answer 8

well, you are accelerating the ball from 10.0 m/s to 0 m/s in 10 seconds. \(\Delta v = -10.0 \text{ m/s}\) and \(t = 10 \text{s}\)

Answer 9

you need to find \(a\). Do you have a formula for that?

Answer 10

No

Answer 11

No? What about \(a = \Delta v/\Delta t\)
(\(\Delta t = 10\text{ s}\))

Answer 12

-100 is what I got

Answer 13

the units will be (m/s)/s = m/s^2 which are the dimensions of acceleration

Answer 14

ah alright

Answer 15

-10/10 = -100?

Answer 16

sorry I accidentally multiplied

Answer 17

-1

Answer 18

I get -1 m/s^2 for the acceleration. (we can ignore the - sign, that just indicates that it is slowing the ball)

If m = 10.0 kg and a = -1 m/s^2, what is F?

Answer 19

10

Answer 20

Right.

Answer 21

thank you I asked that question in physics and got the wrong answer so thank you

Answer 22

Yeah, I don't think the other guy's answer is correct, as it doesn't take the time of deceleration into account

Answer 23

lol why are you on mathematics your skill belongs in the science area

Answer 24

you're awesome