When measuring current, always place the meter in
a. series with the circuit.
c. the highest dc volts position.
b. the highest ac volts position.
d. parallel with the circuit.

a lot of it means it can be "burned" for energy and sold at one price. if it is scarce, the price will go up

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.

i already answered it by 34/s