Diagram 4 shows the speed-time graph of a particle for a period of 20 seconds. Given the total distance travelled by the particles for the period of 20 seconds is 170m.
(a) State the uniform speed, in m/s, of the particles.
(b) Calculate the value of k.
(c) Find the average speed, in m/s, of the particles for the period of 20 s.
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