Complete the following statement: A collision is elastic if the final kinetic energy is zero. the objects stick together. the final momentum is zero. the total kinetic energy is conserved. the final velocities are zero.
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- Mass m = 0.1 kg moves to the right with speed v = 0.39 m/s and collides with an equal mass initially at rest. After this inelastic collision the system retains a fraction = 0.89 of its original kinetic energy. If the masses remain in contact for 0.01 secs while colliding, what is the magnitude of the average force in N between the masses during the collision? Hints: All motion is in 1D. Ignore friction between the masses and the horizontal surface. You will probably need to use the quadratic formula to solve the resulting equations. VR must be greater than VL since the masses can't pass through each other!A pendulum falls from a horizontal position and strikes a stationary mass at its vertical position, with a perfectly elastic collision. Calculate the speed of the stationary mass just after the collision. 0.750m m2 m, = 2.50 kg m, = 8.50 kgConsider a one-dimensional elastic collision between a moving object A and an object B initially at rest. How would you choose the mass of B, in comparison to the mass of A, in order that B should recoil with the greatest speed? Explain.
- A billiard ball rolling across a table at 1.70 m/s makes a head-on elastic collision with an identical ball. Find the speed of each ball after the collision when each of the following occurs. (a) The second ball is initially at rest. first ball ?m/s second ball ?m/s (b) The second ball is moving toward the first at a speed of 1.10 m/s. first ball ?m/s second ball ?m/s (c) The second ball is moving away from the first at a speed of 0.95 m/s. first ball ?m/s second ball ?m/svertically aligned, both balls are released from rest at the same time, to fall through a distance of 1.20 m. (a) Find the mag- nitude of the downward velocity with which the basketball reaches the ground. (b) Assume that an elastic collision with the ground instantaneously reverses the velocity of the basketball while the tennis ball is still moving down. Next, the two balls meet in an elastic collision. To what height does the tennis ball rebound? Figure P9.17 17. A tennis ball of mass 57.0 g is held just above a basketball of mass 590 g as shown in Figure P9.17. With their centers TA 5.00 kg chunk of ice is sliding at 12.0 m/s on the floor of an ice-covered valley when it collides with and sticks to another 5.00 kg chunk of ice that is initially at rest (Fig.). Since the valley is icy, there is no friction. After the collision, how high above the valley floor will the combined chunks go?
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