1.a 45 kg ice skater with a ball of mass 2.0 kg moved in a straight line with a speed of 10 m/s . While moving with this speed , he then throws the ball horizontally in the direction of his movement . the speed of the ball just after it comes out of the hand is 30 m/s.I) Assuming frictionless surface determine the velocity of the skater just after the ball is thrown. II) determine the import import it on the ball by the skater. C) an object mass 0.3 KG an initial speed, seven and mass undergoes head on elastic collision with the second object of mass 0.5 KG and initial speed 10 M/ass if the two balls were initially moving in the opposite directions before collision, then determine the velocity of the balls after the collision.2. A roller coaster of mass 42 KG is released from rest from the star position if 1800 j of heat energy is lost due to friction with the track then calculate the speed of the roller coaster when it is odd location be [hint conservation of energy) ?

A roller coaster of mass 42 kg is released from rest from the start position (Fig. 3.2). If 1800 J of heat energy is lost due to friction with the track, then calculate the speed of the roller coaster when it is at location B (Hint: conservation of energy.) [4] Start V = 0 h = 25 m h = 20 m B Fig. 3.2