Question

14) Three different-mass projectiles are launched at different angles of elevation from the of a building. Each particle has the same initial kinetic energy. Which particle has the greatest speed just as it impacts with the ground A. The one launched at the highest angle of elevation B. The one with the highest mass C. The one with the lowest mass D. They all will have same kinetic energy on impact. 15) Two masses m, and m2 with m;> m2, have momenta with equal magnitudes. How do their kinetic energies compare? A. KE; <KEZ B. KE, > KEZ C. KE1 = KE2 16) A rock is moving with speed v. If the mass of the rock were tripled and the speed were reduced to v/3, which of the following statements would be true A. The kinetic energy of the rock is smaller than in the first case, but the momentum is larger. B. The kinetic energy of the rock is smaller than in the first case, but the momentum of both are the same. C. The kinetic energies of the rocks are the same in both cases D. The kinetic energies of the rocks is 1/9 of its previous value. 17) In an automobile collision, how does an airbag lessen the blow to the passenger? Assume as a result of the collision, the passenger stops A. The airbag decreases the momentum change of the passenger in the collision B. During the collision, the force from the airbag is greater than the force from the windshield or dashboard, so the passenger cannot hit the hard objects C. The stopping impulse is the same for either the hard objects or the airbag. Unlike the windshield or dashboard, the airbag gives some, increasing the time for the slowing process and thus decreasing the average force on the passenger D. The airbag is there to ensure the seatbelt holds

Answer 1

option D) They will have same &E on impact as using conservation I me, 24 migh Image V depends on Vi andh which is same su ophon D mv, = m 2 P, = P2 KER mi> m2 kf < ke, optionA Scanned with CamScanner