Mechanics 1. Define Newton's three laws of motion. (3 marks) 2. Calculate the acceleration of a 5 kg object subjected to a force of 20 N. (2 marks) 3. Describe the principle of conservation of momentum. (3 marks) 4. Explain the difference between kinetic and potential energy with examples. (3 marks) 5. A car accelerates from rest to 20 m/s in 10 seconds. Calculate its acceleration and the distance traveled. (4 marks) 6. What is the work done by a force of 50 N moving an object 3 m? (2 marks) 7. Explain the concept of terminal velocity. (3 marks) 8. Calculate the gravitational force between two 10 kg masses separated by a distance of 2 m. (Use G = 6.67 x 10^-11 N m/kg) (4 marks) 9. Describe the motion of a projectile and derive the equation for its range. (5 marks) 10. Explain the difference between elastic and inelastic collisions. (3 marks)