HANDWRITTEN ANSWERS ONLY (NOTEXT)

HANDWRITTEN ANSWERS ONLY (NOTEXT)

HANDWRITTEN ANSWERS ONLY (NOTEXT)

8. Two snowmobiles, Frosty and Snowflake. of equal masses suffer a rear-end collision; Just before the collision, Frosty's velocity is 25 m s'1 east and Snowflakes velocity is 10 m s'1 in the same direction. Just after the collision, Frosty is moving 13 me1 towards the east. at) What is Snowake's velocity immediately after the collision? 3 marks b} Was this an elastic collision? Justify your answer by calculation. 4 marks 9. A 1600 kg van travelling west at 4 ms1 collides with a 1200 kg car travelling east at 9 ms-i. The vehicles lock together. a] Find the speed and direction of the tangled wreck immediatelyr after the collision? 3 marks b) The collision occurs in 0.5 5. Determine the average force of the 1600 kg van on the 1200 kg vehicle. 3 marks c] What is the impulse on the 1200 kg vehicle due to the collision? 3 marks 10. A student pushes on a box initially at rest on a smooth surface. She exerts a constant force of 40 N on the box, and it moves a distance of 5 m in the direction of the force. a} How much work was done by the student on the box? 2 marks b) As a result ofthe work done by the student, the box gains kinetic energy. Explain how much kinetic energy the box will have after moving 5 m. 2 marks c) Describe how the Law of Conservation of Energy applies to the student and the box. In your answer, please ensure you demonstrate that you understand the Law of Conservation of Energy. 3 marks 11. A shelf stacker in a store lifts a 4.5 Kg box from the ground onto a shelf 3?.6 cm high. Calculate the gravitational potential energy of the box when it is on the shelf. 4 marks 12. A crane can lift a load of 4.5 tonnes vertically through a distance of 34.5 metre in 6.8 seconds. Calculate the power of the crane. 5 marks 13. An arrow with a mass of 45.3 g is fired vertically into the air at 82.5 ms1 from a height of 1.41 m. Calculate the speed of the arrow when it reaches a height of 36.3 m. 7" marks