The use of air bags in cars reduces the force of impact by a factor of 110.(the resulting force is only as great.) what can be said about how the airbag changed the duration of the collision?

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.

Which is not true about oxygen-17 and oxygen-18?

What is the measure of a change in an objects velocity?