A piece of brass of mass 40.0g is hung on a spring balance from a rigid support and completely immersed in kerosene of density 8.0 x 10²kgm. Determine the reading on the spring balance (g = 10ms"?, density of brass = 8.0 x 10®kgm)

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?