The ability to store electrical charge is called

What is the final velocity of the initial velocity of 25 and -50?

Light from the sun reaches the earth in 8.3 minutes. the velocity is 3.00 x 10^8 m/s. how far is earth from the sun? i know how to get to d = (3 x 10^8 m/s)(498 sec). i just don't know how to get from there to the answer being 1.5 x 10^11 m.

Work out sian speed for the first 30 minutes of her journey. give your answer in km/h.