Calculate the change in the kinetic energy of the satellite when it moves from its 850 km orbit to one at a height of 700 km above the Earth’s surface. Make it clear whether the change in kinetic energy is an increase or decrease. The mass of the satellite is 2100kg
I tried to calculate the velocities of at the two distances and then calculate change in KE and then I tried to calculate change in V and then use the formula W=m*change in V but it didn't work. The mark scheme says to equate the centripetal force equation and the force between 2 masses. They got Ek= GMm/2 *(1/r1 -1/r2). I have no idea how they got that.