Some wooden rulers do not start with 0 at the edge, but have it set in a few millimeters. how could this improve the accuracy of the ruler?

=force × distance a. work b. velocity c. pressure d. momentum

If a balloon is taken outside on a very cold day, what will occur?

Aballoon is rising vertically upwards at a velocity of 10m/s. when it is at a height of 45m from the ground, a parachute bails out from it. after 3s he opens his parachute and decelerates ata a constant rate 5m/s.when. (a) what was the height of the parachutist above the ground when he opened his parachute? (b)how far is the parachutist from the balloon at t=3s? (c)with what velocity does the parachutist hit the ground? (d)after how long does the parachutist hit the ground after his exist from the balloon?