amy who has a mass of 67 kg is riding her bicycle in the country she is traveling at 11 m/s when she begins to coast down a hill she then coasts up another hill that is 20 m high and comes to a stop just as she reaches the top how high was the first hill in m

After the near spacecraft passed mathilde, on several occasions rocket propellant was expelled to adjust the spacecraft's momentum in order to follow a path that would approach the asteroid eros, the final destination for the mission. after getting close to eros, further small adjustments made the momentum just right to give a circular orbit of radius 45 km (45 × 10^3 m) around the asteroid. so much propellant had been used that the final mass of the spacecraft while in circular orbit around eros was only 545 kg. the spacecraft took 1.04 days to make one complete circular orbit around eros. calculate what the mass of eros must be.

What is the earliest point in the universe that we can observe? why can’t we see back further than this?

Aplane travels 1000 miles in 5 hours .what is the planes average speed?