Determining maximum speed of ball

Question

Assignment:

Question 1. A ball with a mass of 200 g is whirled in a circle at the end of a string 100cm long whose breaking strength is 100 N. neglecting gravity, the maximum speed of the ball is approximately.

• 2m/s
• 7m/s
• 10m/s
• 50m/s

Question 2. A 1-kg object is moving at 10m/s. To double its kinetic energy, its speed should be increased to approximately.

• 14m/s
• 15m/s
• 20m/s
• 40m/s

Question 3. A 430-g soccer ball lying on the ground is kicked with a force of 800N. If the kick lasts 0.01 s, the ball flies off with a speed of.

• 0.0186 m/s
• 0.182 m/s
• 1.90 m/s
• 18.6 m/s

Question 4. The speed of a 4000-kg truck whose KE is 1.8 MJ is

• 0.95m/s
• 30m/s
• 94m/s
• 900m/s

Question 5. The 2.5-kg head of an ax exerts a force of 80kN as it penetrates 18mm into the truck of a tree. the speed of the ax head when it strikes the tree is.

• 1.2m/s
• 3.4m/s
• 34m/s
• 107m/s