Aminiature spring-loaded, radio-controlled gun is mounted on an air puck. the gun's bullet has a mass of 7.00 g, and the gun and puck have a combined mass of 150 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 0.530 m/s. what is the bullet's speed?

Explanation:

Given

mass of bullet

mass of gun and Puck

speed of gun and Puck is

Let speed of bullet be u

conserving Momentum

initial momentum=Final Momentum

negative sign indicates that bullet is moving in opposite direction        

answer: option c. i.e. electric current flowing “downhill” from the negative electrode to the positive electrode in a battery

explanation:

the water analogy to the circuits define the pipes (water flows) to the electric current. now, we know that the electric current flows from the positive terminal to the circuit (as shown in the diagram attached).

hence, option c is the correct answer.