Question

Assume that you built a robot with a 0.0400s reaction time. How far down (in centimeters) would a ruler fall before being caught by the robot?

Answer 1

hey

Answer 2

would u use the formula d=1/2at^2+vi(t)

Answer 3

Certainly! Would would a be, as well as the initial velocity.

Answer 4

a is 981 and initial velocity is 0?

Answer 5

Exactly!

Answer 6

ok one more question if u have time

Answer 7

how could u find the velocity of the ruler right before the robot caught it

Answer 8

Sure thang!

Answer 9

would u use vf^2=vi^2+2ad?

Answer 10

or how would u find it?

Answer 11

Yeah, that's the equation you would use.

Answer 12

ok would vi again be 0?

Answer 13

and u would use the distance u got form the last question correct?

Answer 14

is that right ? :D

Answer 15

hello ? :o

Answer 16

@amistre64

Answer 17

s = 1/2 g t^2 should suffice

Answer 18

the velocity? v = -gt is the usual setup

Answer 19

convert cm to m, or m to cm along the way tho

Answer 20

so it would be the same as using vf^2=vi^2+2ad wouldnt it?

Answer 21

maybe .. if you want to go that route

Answer 22

i dont have the physics formulas in memory, i just know it from a more mathical perspective

Answer 23

would the answer be 39.2?

Answer 24

cm/s squared

Answer 25

for velocity? -9.8(.04) in m/s

Answer 26

1m= 100cm ... so divide by 100 to get cm/s

Answer 27

multiply not divide :)

Answer 28

cant u just say its -981 isntead of 9.81

Answer 29

i recall gravity being -9.8 m/s^2

Answer 30

use whatever value for gravity your comfortable with

Answer 31

m*cm/m = cm so multiply by 100 is the conversion factor

Answer 32

yea so the velocity would be 39.2 cm/s^2 correct ? :D

Answer 33

velocity is direction and magnitude, so -39.2 might be more proper

Answer 34

yea i considered down to be positive for this lab so i didnt have to deal with negative numbers, but thank u guys so much!! :D