Two 2.0 kg bodies, a and b, collide. the velocities before the collision are
v→a=(15i^+30j^) m/s
and
v→b=(−10i^+5.0j^) m/s
. after the collision,
v→a=(−5.0i^+20j^) m/s
. what are (a) the final velocity of b and (b) the change in the total kinetic energy (including sign)?

Explanation:

Given

mass of body A

mass of body

Velocity before Collision is

after collision

let and velocity of B after collision in x and y direction

conserving momentum in x direction

as thus

Conserving momentum in Y direction

thus velocity of B after collision is

(b)Change in total Kinetic Energy

Initial Kinetic Energy of A  And B

Total initial Kinetic Energy =1250 J

Final Kinetic Energy of A  And B

Final Kinetic Energy

Change

answer: d. a cme increases the amount of energy in the solar wind

explanation:

coronal mass ejections, also called cmes, are large clouds of plasma and magnetic field that erupt from the sun. only when the cloud is aimed at earth will the cme hit earth and therefore cause impacts. high-speed solar wind streams come from areas on the sun known as coronal holes.

the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it