2. You pull a 5 kg box over a distance of 7 m (see image below) with an accelera

Question

2. You pull a 5 kg box over a distance of 7 m (see image below) with an acceleration of 2.4 m/s How much work do you do? A) 2.4J B) 12J C) 16.8J D) 60 84J A 10-meter long, horizontal cannon is used to accelerate a 2.0 kg ball into the air. A constant force of 13.2 N is used to accelerate the ball the length of the cannon. How much work does the cannon do? 3. A) 13.2J 26.41 C) 58.6J D) 1321 E) 264J A 10-meter long, horizontal cannon is used to accelerate a 2.0 kg ball into the air. A constant force of 13.2 N is used to accelerate the ball the length of the cannon. Assuming the ball starts from rest, what is the ball's speed as it exits the cannon? A) 3.6 m/s B) 13.2 m/s C) 16.2 m/s D) 20.0 m/s E) 58.6 m/s

Explanation / Answer

3) Workdone by canon on the ball, W = F*s*cos(theta) (here F is the force and s is the displacement)

= 13.2*10*cos(0)

= 132 J

so, option D is the correct answer.

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