1. Each of the three identical hockey pucks shown in the figure ( Figure 1 ) is

Question

1. Each of the three identical hockey pucks shown in the figure(Figure 1) is acted on by a 3 N force. Puck A moves with a speed of 7 m/s in a direction opposite to the force; puck B is instantaneously at rest; puck C moves with a speed of 7 m/s at right angles to the force

a) Rank the three pucks in order of the magnitude of their acceleration, starting with the smallest.

kg shopping cart. You stop for a moment to add a bag of dog food to your cart. With a force of 12.0N , you now accelerate the cart from rest through a distance of 2.20m in 2.75s .

a) What was the mass of the dog food?

3. A baseball of mass

m and initial speed v strikes a catcher's mitt.

a) If the mitt moves a distance

?x as it brings the ball to rest, what is the average force it exerts on the ball?

Explanation / Answer

1a) they are all the same time

2a)first, determine the acceleration:

d=.5at

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