Question

13.
The velocity time graph of an ascending passenger lift is in
the figure shown below. The following is the velocity-time
graph for moving body. Find:
a) The velocity with which motion started
b) Velocity of the body at point C.
c)
Acceleration acting on the body between A and B.
d)
Acceleration acting on the body between B and C.

Answer 1

Answer

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Solution

(i) For motion during the first two seconds , <br> change of velocity

<br> time taken

<br> Thus , acceleration

<br>

<br> (ii) For motion between

second and

second , <br> change of velocity

<br> time taken

<br> Thus , acceleration

<br> (iii) For motion between

sec to

second , change of velocity

<br> time taken

<br> Thus , acceleration

<br> Negative sign shows retardation