K.C.S.E Physics Q & A - MODEL 2017PP1QN14

K.C.S.E Physics Q & A - MODEL 2017PP1QN14

(a) A tape attached to an accelerating trolley passes through a ticker timer that makes dots on it at a frequency of 50Hz. The ticker timer makes 10 dots on a 10cm long tape such
that; the distance a between the first two dots is 0.5 cm and the distance b between the last two dots is 1.5cm.

​(i) Determine the velocity of the trolley at:
(I) distance a, 
(II) distance b. 
(ii) Determine the acceleration of the trolley. 
(b) State with a reason what would be observed on the spacing between the dots on the tape when the trolley is made to move on a horizontal surface. 

ANSWERS

​(b)  The spacing reduces  with time.
 The trolley decelerates with time on a horizontal surface.