Question

A ball of mass m is thrown vertically upward with an initial speed of v. It reaches a maximum altitude of h If some air resistance is present, the amount of work the air resistance does on the ball as it is rises to altitude h may be expressed as:

1. mgh

2. mg(h-v)

3. mgh + 0.5mv^2

4. 0.5mv^2 - mgh

5. 0.5mv^2

An object of mass m moves at initial speed v on a horizontal plane. Friction brings it to rest over a distance x. The average force of friction on the object while it is slowing down is:

1. (mv)/x

2. (mv^2)/x

3. (0.5mv^2)/x

4. (2mv)/x

5. (mg)/(xv)

Answer #1

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A
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