Question

the normal force of acting in a surface is what
give one word
the envolp of air up to a height of about 300km around the earth​

Answer 1

Answer:

The collisions are perfectly inelastic (which means colliding objects stick together) and the "stationary object" is a wall of essentially infinite mass (like a really thick stone wall or a really big tree). This means that all objects come to rest after the collision. The force experienced by anything depends on how long the collision lasted, so we need to stipulate that the collisions last the same time. For this scenario, the force felt by the 140 mph truck would be twice as large as the force felt by the 70 mph truck. This is a situation where you are right.

The collisions are perfectly inelastic and the "stationary object" is the other truck. Again, assume that the collisions last the same time. In this situation, the trucks are not at rest after the collision if one truck is parked before the collision. You can (neglecting any friction) easily calculate their speeds after the collision using momentum conservation: 140M=2Mv, so v=70. But, note that the change in speed for either truck for either collision is 70 mph, so this is a situation where your teacher is right.

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