4. A car travels with a uniform velocity of 20 m/s for 5 s. The brakes are then applied and the car is uniformly retarded. It comes to rest in further 8 s. Draw a graph of velocity against time. use this graph to find:
a) The distance travelled in first 5 s,
b) The distance travel after the brakes are applied
c) Total distance travelled
d) Acceleration during the first 5 s and last 8 s.
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Answer:
a)distance travelled is 100m.
b)distance travelled after the brakes are
applied is 240m. c)total distance travelled
is(100+240)m=340m
d)acceleration in first five seconds was 0 and retardation in the last eight seconds
is 2.5.
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