Homework Help: physics

Posted by aisha on Sunday, August 7, 2011 at 7:23am.

A cyclist is cycling at a uniform velocity of 8m/s for 8 seconds. He then stops paddling and
the cycle comes to rest in next ten seconds. Draw the velocity-time graph and calculate: (i)
the average retardation.(ii) the distance covered with uniform velocity.(iii) the distance
covered with variable velocity.(iv) the average velocity of the cyclist.

physics - drwls, Sunday, August 7, 2011 at 10:46am
You paddle a canoe but you pedal a bicycle. What do you mean by "retardation?"

You will have to draw the graph yourself. If you plot V on the y axis and time on the x axis, you have a horizontal line at V = 8 from t = 0 to t = 8; then the line drops in a slanted straight path to V=0 (the x axis) at t = 18.

ii) 8 * 8 = 64 m
iii) (1/2)*10*8 = 40 m
iv) (64+40)/(10+8) = 5.78 m/s

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