# Physics

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How much kinetic energy does a 1 kg ball have if it has a velocity of 10 m/s?
a. 100 J.
b. 50 J.
c. 10 J.
d. 5 J.
The airbag in a car works in a collision by . . .
a. increasing the time of the impact to the person.
b. reducing the impulse to the person.
c. reducing the momentum of the person.
d. increasing the force on the person.

A cannonball shot from a cannon with a long barrel will have a greater muzzle velocity because the cannonball receives a greater . . .
a. force.
b. impulse.
c. both force and impulse.
d. neither force nor impulse.

• Physics -

These are not hard questions. Review the definition of impulse
(Force x time) = (momentum change)

Physics is about teaching you to think, not an exercise in keyboarding.

1.C
2.d
3.A
I don't know is it correct.

• Physics -

1 C
2.D
3.B

• Physics -

1. is B (1/2) M V^2
2. is A
The "cushioning" of the air bag reduces the force necessary to stop the person, thereby avoiding head injury.
3. is B

• Physics -

For do I multiply 1/2 x10=5x10=50?
SOrry for asking a easy question. I'm not smart.

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