During a perfectly elastic collision between two bodies, which of the following statements is always true? Answers: Kinetic energy is not conserved. a. Kinetic energy is conserved and momentum is conserved. b. Kinetic energy is conserved and momentum is not conserved. C. d. Kinetic energy is not conserved and momentum is not conerved. Kinetic energy is conserved. е.

a block with a mass of 0.5 kg is released from rest on a frictionless track at a distance 2.5m above the top of the table. it then collides elastically with an object having mass m2=1.0kg that is initially at rest on the table as shown in the figure. the table is h2=2.oo m . a)How far away from the bottom of the table do the objects land ? Hints : determine the velocities just after the collision . how high does object 1 travel back up the track. b) suppose the collision is inelastic , where does combined object land   please see attached image

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A 50 kg teen running 6 m/s jumps onto a 6 kg skateboard that is stationary. After he jumps on, the combined speed of the skateboard and the teen is 5.4 m/s. The kinetic energy lost in the collision is: A. both 11% and 96 joules B. 96 j C. 11% D. 0

An empty freight car with a mass of 10,000 kg rolls at 5 m/s along a level track and collides with a loaded car with a mass of 20,000 kg, standing at rest with brakes released. Friction can be neglected. If the cars couple together, find their speed after the collision. a. Find the decrease in kinetic energy as a result of the collision. b. With what speed should the loaded car be rolling towards the empty car for both to be brought to rest by the collision? Show the figure/fbd, given and formula used.

A 26-gg rifle bullet traveling 240 m/sm/s embeds itself in a 3.2-kgkg pendulum hanging on a 2.9-mm-long string, which makes the pendulum swing upward in an arc.  a. Determine the vertical component of the pendulum's maximum displacement. Express your answer to two significant figures and include the appropriate units. b. Determine the horizontal component of the pendulum's maximum displacement. Express your answer to two significant figures and include the appropriate units.