If a star is moving away from you how does it affect the wavelength of the light waves that reach you?

We put a force of 50n on an object and the acceleration is 100 m/s². what is the mass of the object?

What object a collides with object b and bounces back its final momentum is?

When you jump from an elevated position you usually bend your knees upon reaching the ground. by doing this, you make the time of the impact about 10 times as great as for a stiff-legged landing. in this way the average force your body experiences is a) less than 1/10 as great. b) more than 1/10 as great. c) about 1/10 as great.d) about 10 times as great.