Question

a force of 8.0N acts on a 2.0kg mass for 5.0s

a. what is the change in momentum of the mass?
b. What is the change in the velocity of the mass?

Answer 1

Impulse = change in momentum = force*time

Answer 2

a. what is the change in momentum of the mass? ^ use the above

Answer 3

8x5 =40

Answer 4

how do i incorporate mass?

Answer 5

Don't forget units

So your change in momentum is 40 kg m/s

Answer 6

b. What is the change in the velocity of the mass?

You know the change in momentum. You know the mass hasn't changed, only the velocity v \[\large m \Delta v = 40\]

Answer 7

so how would i arrivate at my answer lol. Still confused

Answer 8

i understand where the 40 came from and m is 2

Answer 9

Mass times change in velocity = 40

I'm sure you can use some algebra. You know what the mass is.

Answer 10

oh 20

Answer 11

for a isn't the units kgNS

Answer 12

and waht are the units for b?

Answer 13

Well you found the change in velocity.. what are the units for velocity?

Answer 14

For a, kg*m/s since you're multiplying mass times velocity, but kg*N*s is also acceptable though, they're equivalent.

Answer 15

Since the units for newtons, N = kg m/s/s

Answer 16

and so what are they for b?

Answer 17

Well you found the change in velocity.. what are the units for velocity?

Answer 18

m/s

Answer 19

wow i feel stupid!!

Answer 20

haha :)