If a spacecraft is pushed by a thruster, what will happen

a, the spacecraft will move and then slowly come to a stop on its own.

b. the spacecraft will not move because it only works on earth.

c. the spacecraft will not move due to air resistance.

d. the spacecraft will move and will not stop until it is stopped by an equal and opposite force.

Wavelength,frequency,and energy are related.what happens to a wave as it’s wavelength gets shorter?

This is important 1. what happens to the speed of molecules in water vapor when it condenses to form a liquid? (2 points) the molecules slow down. the molecules speed up. the molecules slow down and then speed up. the molecules speed up and then slow down. 2. how might human activities change to compensate for a decrease in water supplies? (2 points) humans might build a factory. humans might build drainage systems. humans might extract more water from the ground. human behavior does not change because of the water cycle. i'll be grateful if anyone can answer these 2 questions !

Ben (55kg) is standing on very slippery ice when junior (25kg) bumps into him. junior was moving at a speed of 8 m/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. give the answer in m/s. describe the work you did to get the answer.