Problem 4: Two objects, 1 and 2, are dropped from rest from the same height, and fall to the ground in the absence of air resistance. Object 1 has a mass m, while object 2 has a mass 2m. What is the ratio of their kinetic energies, K₁/K2, just before striking the ground? lo 1 1/4 2 4 1/2

Problem 4: During an ice show, a 67.5-kg skater leaps into the air and is caught by an initially stationary 82.5 kg skater. Part (a) What is their final speed, in meters per second, assuming negligible friction and that the 67.5 kg skater's initial horizontal speed is 4.25 m/s? Numeric : A numeric value is expected and not an expression. v'= Part (b) How much kinetic energy is lost, in joules? Numeric : A numeric value is expected and not an expression. ΔΚΕ10st Ξ

PRINTER VERSION 1 BACK NEX Z Your answer is partially correct. Try again. In the figure, a frictionless roller coaster car of mass m = 832 kg tops the first hill with speed vo = 19.0 m/s at height h = 44.0 m. What is the speed of the car at (a) point A, (b) point B, and (c) point C? (d) How high will the car go on the last hill, which is too high for it to cross? Use g=9.81 m/s2. First hill- B h/2 C (a) Number19 UnitsTm/s (b) Number28.15 UnitšT m/s (c) Number 35 Units m/s (d) Number" Units Click if you would like to Show Work for this question: gen/shared/assignment/test/aglist.uni?id3. Open Show Work earch 9:18 PM ENG 4/4/2021 13 ) is 16 17 .ロ/京 19home & 4 6. 7. 8. 9. 近

A Block-Spring System A block of mass 1.0 kg is attached to a horizontal spring that has a force constant of 2,000 N/m as shown figure (a). The spring is compressed 3.0 cm and is then released from rest as in figure (b). (a) A block attached to a spring is pushed inward from an initial position x-O by an external agent. (b) At position x, the block is released from rest and the spring pushes it to the right. (For the following, when entering a mathematical expression, do not substitute numerical values; use variables only.) (a) Calculate the speed of the block as it passes through the equilibrium position x - 0 if the surface is frictionless. SOLUTION Conceptualize This situation has been discussed before, and it is easy to visualize the block being pushed to the right by the spring and moving with some speed at x = 0. Categorize We identify the system as the block and model the block as --Select- system. Analyze In this situation, the block starts with v, - 0 at x, = -3.0 cm, and we…