the speed of an automatic lift increases from 0 to 40cm/sec for the first 30 seconds it then travels at a constant speed of 40 cm/sec for 20 seconds. The lift then comes to rest in the final 20 seconds. represent thi information as a speed time graph and use it to find the distance travelled by the lift. Also find the average speed of the lift.(Also write value)
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Answer:
(i) Acceleration during first two seconds =
2−0
4.6−0
=2.3m/s
2
(ii) Acceleration between second and tenth second is zero, since the velocity is constant during this time.
(iii) Acceleration during last two seconds =
12−10
0−4.6
=−2.3m/s
2
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