HANDWRITTEN ANSWERS ONLY (NOTEXT)

HANDWRITTEN ANSWERS ONLY (NO TEXT)

HANDWRITTEN ANSWERS ONLY (NO TEXT)

1. The curve below is a distance-time graph for an object moving in a straight line. The graph shows how the distance (in metres) changes with time (in seconds). A tangent to the curve is drawn at P. 50 40 30 Distance/m 20 P 10 0 0 5 10 15 20 25 30 Time/s a) How long does the object's journey last, according to the graph? 1 markb) What is the average speed of the object over its journey? 3 marks c) Find the object's instantaneous speed at the 20 s mark. On the graph, show CLEARLY the points you used to work out the answer to this question AND draw the triangle formed by your points. 4 marks 2. The graph below shows the change in speed with time of an object moving in a straight line. The speed is in metres per second (m s"), and the time is in seconds (s). 20 L U" Speedfm s" l. D ! I \"I E! IN II Find the distance covered in the rst 5 s of the journey. 3 marks 3. An object is moving due south at 1-5 m s". when a force accelerates it at 4 m s'2 in a southerly direction. How long will it take for the object to reach a velocity of 48 m 5'1 south? 3 marks 4. An object is moving at 50 m 3'1 north. A southerly force acts on it. producing an acceleration of 20 m s'2 in the direction of the force. After '10 5, what will the velocity;f of the object be? 4 marks 5. The average Australian car weight is about 1250 kg. The speed limit in built up areas is 50 kilometres per hour. Calculate the kinetic energy. 4 marks B. Forces of 5.0 N easterly and 3.0 N northerly are acting on a tree. Determine the resultant force acting on the tree. Include your vector diagram 4 marks 7. Explain how airbags may reduce injuries to drivers) Make sure to include relevant formulae in your answer. 3 marks