A3kg object has a 20n force applied to it for 3 seconds.
-how fast is the object traveling at the end of the 3 seconds?
-if it started from rest, how big an impulse did the object experience?

1) 20 m/s

First of all, we can find the acceleration of the object using Newton's second law:

where

F = 20 N is the force applied

m = 3 kg is the mass of the object

a is the acceleration

Solving for a,

Now we can find the final velocity of the object using the suvat equation:

where

u = 0 is the initial velocity

is the acceleration

t = 3 s is the time

Substituting,

2) 60 kg m/s

The impulse exerted on the object is equal to its change in momentum:

where

m is the mass

v is the final velocity

u is the initial velocity

For the object in the problem

m = 3 kg

u = 0

v = 20 m/s

Substituting,