(a) at what height above earth's surface is the energy required to lift a satellite to that height equal to the kinetic energy required for the satellite to be in orbit at that height? (b) for greater heights, which is greater, the energy for lifting or the kinetic energy for orbiting?

the answer is c i did the same question so i know that's right!

answer; how far out of place which the object finished relative to the starting location;

when jerome paddle in flowing river towards east the net speed of jerome will increase

so the net speed of jerome will be given as

now the speed of paul will be same as it is given as he is running on the ground

so

so here we can say since the speed of jerome is more so he will win the race

now as we know the distance so the time difference is given as

so jerome will reach first and the time difference will be 203.55 s or 3.4 min