Question: draw a distancetime graph for an object moving in a...
Draw 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. Distance /m (0, 10, 20, 30, 40 and 50) and Time /s ( 0, 5, 10, 15, 20, 25, 30 ).
a) How long does the object’s journey last, according to the graph? 1 mark
b) 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