Question

A catcher stops a ball travelling at 26.2 m/s in a distance of 85.1 cm and feels a force of 313 N against his glove. What is the mass of the ball?

Answer 1

First convert cm to m, units need to match.

Answer 2

ok,then

Answer 3

?

Answer 4

figure out what variable you are given.

Answer 5

vi, vf, x, ,,,

Answer 6

we are given the velocity
i wonder how do you figure out the change in velocity?

Answer 7

or you know acceleration

Answer 8

acceleration=change in velocity

Answer 9

Force=mass * acceleration
so if we can figure out acceleration we are basically done since we have force already

Answer 10

F=m*a => m=F/a

Answer 11

-9.8m/s^2

Answer 12

why is that?

Answer 13

cause i say so... idk i didn't look quite at he problem

Answer 14

well i'm not saying your wrong
i just don't know anything about physics lol
but there are equations which i know
but i don't see how to find change in velocity

Answer 15

time=26.2/85.1

Answer 16

we get this from speed=distance*time

Answer 17

there is an equation that relates these all i believe ijust don't remember it

Answer 18

i got -9.8 acceleration from gravity

Answer 19

but it is not in freefall lol

Answer 20

Vf=0
Vi=26.2 m/s
x=85.1 cm=0.851 m

Find acceleration by solving for a:

Vf^2=Vi^2+2ax

Answer 21

so you are saying final velocity is 0 since catcher stops ball?

Answer 22

Once you solve for acceleration

F=ma

m=F/a

Answer 23

ok i think this makes sense i just didn't notice we consider that
but that makes sense

Answer 24

yes, final velocity is implicit. It is zero.

Answer 25

hahahah bob u are right coz we will definitely find acceleration before solving the problem f=ma

Answer 26

if the ball was going on a projectile,u know the final velocity at the highest point is 0