Physics Help?

Question

A miniature spring-loaded, radio-controlled gun is mounted on an air
puck. The gun's bullet has a mass of 5.00 g, and the gun and puck have
a combined mass of 120 g. With the system initially at rest, the radio
controlled trigger releases the bullet causing the puck and empty gun
to move with a speed of 0.500 m/s. What is the bullet's speed?



F 4.80 m/s
G 11.5 m/s
H 48.0 m/s
J 12.0 m/s
K 23.0 m/s

Answer 1

Ok, here you just need to use the conservation of linear momentum.

Because, when you fire a gun or anything, there is an speed of the bulltet that goes out from the gun, and of course there is an speed that makes you back off with the gun.

So, here we go :

(5/1000)*v = (120/1000)*0.5

v = 12 m/s

If the bullet is going to the right, the gun and the puck will be going to the left.

Hope that helped

Answer 2

so ap physics is purely somewhat no longer ordinary, and as constantly relies upon on the instructor as properly (is he/she a good instructor? plenty or little artwork, etc...) additionally relies upon on what else you're taking once you're taking ap physics, if the different training are not no longer ordinary and you will possibly be able to concentration on the class, then it relies upon and it relies upon on you, and how the venture is for you, and how no longer ordinary you desire to artwork at it sorry if this would not help, yet there are various factors...