The following four objects sit on a table on earth. which experiences the greatest normal force from the table?
a. a book weighing 2 n
b. a mug with a mass of 250 g
c. a metal pen with a mass of 0.3 kg
d. a calculator experiencing a gravitational force of 3.5 kg m/s2

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?