Someone gave the alarm. The great ship turned.The turning is sharp.The ship wanted to avoid a collision. A collision was direct. A: After the alarm had given, the great ship turned sharply to avoid a direct collision. B: Before the alarm had been given, the great ship turned sharply to avoid a direct collision. C: After the alarm had been given, the great ship turned sharply to avoid a direct collision. D: When the alarm had been given, the great ship turned sharply to avoid a direct collision.

Two masses collide and stick together. Before the collision one of the masses was at rest. Is there a situation in which the kinetic energy is conserved in such a collision? A: Yes, if the less massive particle is the one initially at rest. B: Yes, if the more massive particle is the one initially at rest. C: Yes, if the two particles have the same mass. D: No, kinetic energy is always lost is such a collision.

The rate of a reaction depends on __________. A: collision frequency B: collision energy C: collision orientation D: all of the above E: none of the above

It was reported that 41 people were killed in a plane crash / collision.

1) Have you ever heard ground collision?2) what are the possible reasons for ground collision?3) What can be done to avoid ground collision?

Effective collision is a powerful collision between active molecules that can produce chemical reactions.

Risk of collision may exist ______.

When you doubt the existence of risk of collision, ________.

After the collision, he examined the considerable ______ to his car.

After the collision, he examined the considerable ________ to his car.