A train car with mass m1 = 590 kg is moving to the right with a speed of v1 = 7.3 m/s and collides with a second train car. The two cars latch together during the collision and then move off to the right at vf = 4.7 m/s. 1)What is the initial momentum of the first train car? 4307 kg-m/s

4307 kg.m/s

Explanation:

Momentum is the product of mass and velocity of an object.

p=mv where p is momentum, m is mass of the object and v is the velocity.

Taking right direction as positive, the initial momentum of the first train car will be 590*7.3=4307 kg.m/s

We know that from law of conservation of linear momentum, the sum of initial momentum equals the sum of final momentum

second mirror gathers light from a faraway object and reflects it to another mirror. - a.

it has to be b, about 97 percent.