Find the potential difference required to pass a current of 0.2a in a wire of resistance 20 ohm

4V

Explanation:

Ohm's law gives that V = I R, that is, potential difference = current x resistance.

We have the current and resistance given to us in the question, so multiply these together to get the potential difference: 0.2 x 20 = 4V

newton's first law of motion

the chart show the masses and velocities of two colliding objects that stick together after a collision.

according to the law of conservation of momentum, the momentum of the object after the collision is  

answer

1,500

kg • m/s.