a small rock bounces off the windshield of a moving car and experiences a large change in velocity. how does the car’s momentum change?

Idon't get it either

Answer the osha construction standard requires flexible cords to be rated for hard or extra hard usage;

Which of the following is an example of an opposing signal? no examplthates given.   i would say, that traffic lights in a city at major intersections direct the flow of traffic in opposite directions so would be an example.also, stop signs on either side of the same street would be an example. at a train crossing, the light for allowing car traffic in opposite directions or not would be another example.