Please answer 9 and 10

10) On a winter day a dad is giving his son a fun ride on a sled. Since there is no hill close by that is steep enough for downhill sledding, he actually pulls the sled behind him, running fast, so that despite the friction from the snow the sled reaches enough speed for the child to get excited. The initial speed of the sled is 1.5 m/s and the mass of the sled and child combined is 20 kg. If dad does 1800 J of work on the sled pulling it and friction does -2550 J of work on the sled, how fast is the sled after it was pulled down a vertical height of 4 m? H gaivio mull egemah is8 (89) Ear damage from diving If the force on the ear drum increases by about 1.5 N above the force from the atmospheric pressure, the membrane can be damaged. When you go scuba diving in the ocean, below what depth could damage to your ear drum occur? Data: Diameter of ear drum 8.2 mm density of salt water: 1.03 x 103 kg m 3 Go) same BL