Within 4.0 s of liftoff, a spacecraft that is uniformly accelerating straight upward from rest reaches an altitude
of 4.50 X 102 m [up).
(a) What is the spacecraft's acceleration?

An object is 10 cm from the mirror, its height is 1 cm and the focal length is 5 cm. what is the image height? (indicate the object orientation by including the + or - sign with the answer.) hi = cm +1 -1 +10 -10

An electron in an x-ray machine is accelerated through a potential difference of 1.00 × 104 v before it hits the target. what is the kinetic energy of the electron in electron volts?

If one object has a large redshift and another object has a small redshift, what can we conclude about these two objects?