Ahot air balloon resting on the ground has a 770 n lift force. the weight of the basket is 150 n, and the balloon plus the gas in it weigh 80 n. if a rider weighing 560 n gets in, which statement is correct?

a. the net force on the balloon is 20 n upward.
b. the net force on the balloon is 790 n upward.
c. the total weight of the balloon is 790 n upward.
d. the normal force of the ground on the balloon is 20 n upward.

i've can't find the solution to this problem, and i really need some on it. i honestly don't think there is a correct answer, but if someone could explain it to me i'd be pretty grateful.

Ben(55 kg) is standing on very slippery ice when junior(25kg) bumps into him. junior was moving at a speed of 8m/s before the collision and ben and junior embrace after the collision. find the speed of ben and junior as they move across the ice after the collision .

Ascrew incorporates which other simple machine? lever wheel and axle inclined plane pulley

Which lists the main components of darwin’s theory of evolution? a. random mutations drive evolution; the evolution of a population happens slowly; organisms have common ancestors; organisms do not change. b. natural selection drives evolution; the evolution of a population happens slowly; organisms have common ancestors; organisms change over time. c. natural selection drives evolution; the evolution of a population happens rapidly; organisms have common ancestors; organisms change over time. d. random mutations drive evolution; the evolution of a population happens rapidly; organisms have common ancestors; organisms do not change.