When we look at the sun, we are seeing it as it was 8 minutes ago. so we can only see the sun "in the past." when you look at the back of your own hand, do you see it "now" or "in the past"?

Astone dropped into a well is heard to strike the water after 8seconds. find the depth of the well if the velocity of sound is 350m/s

When the force acting on an object points at least partially in the direction of the motion the work done is considered to be negative

Ametal ball with a mass of 0.028 kg is dropped from rest at a height of 1.0 meters above the ground. assuming the energy in the ball is conserved, how much kinetic energy will the ball have when it is 0.5 meters above the ground?