hello I need help solving those questions please thank you so much in advance!

n a (6) A 2.58 kg sphere makes a perfectly inelastic collision with a second sphere that is initially at rest. The composite system moves with a speed equal to one third the original speed of the 2.58 kg sphere. What is the mass of the second sphere? Submit Answer Tries 0/10 0 a Water falls at the rate of 278 9/5 from a height of 58.3m into a 7239 bucket on a scale (without splashing). If the bucket is originally empty, what does the scale read 3.175 after the rst drop of water reaches the bucket? Submit Answer Tries 0/10 0 a A 2.65kg steel ball strikes a massive wall at 10.9m/s at an angle of a = 68.6'7 with the plane of the wall. It bounces off with the same speed and angle. If the ball is in contact with the wall for 0.214s, what is the magnitude of the average force exerted on the ball by the wall? Submit Answer Tries 0/10 0 a A 47.3kg girl is standing on a 143kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is a flat, frictionless surface. The girl begins to walk along the plank at a constant velocity, in the positive direction, of 1.45m/s relative to the plank. What is her velocity relative to the ice surface? Submit Answer Tries 0/10 What is the velocity of the plank relative to the ice surface? Submit Answer Tries 0/10 0 a A 11.19 object moving to the right at 20.4cm/s makes an elastic head-on collision with a 14.89 object moving in the opposite direction at 31.4cm/s. What is the velocity of the 11.19 object after the collision (assume positive to the right)? Submit Answer Tries 0/10 What is the velocity of the 14.89 object after the collision