Will get brainiest are bevs or hydrogen fuel cell vehicles a more promising transportation technology for the future? should car companies be required to produce electric cars?

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.

Asmall 21 kilogram canoe is floating downriver at a speed of 1 m/s. what is the canoe's kinetic energy?

If the force applied to an object remains constant, is more power needed for the object to move faster ? explain