Question

A girl walks along a straight path to drop a letter in the letterbox and comes back to her initial position. plot displacement time graph and then velocity time graph.

Answer 1

From the graph of displacement time graph, we can interpret that initial velocity is 0 as displacement and time are 0 .
Velocity after 50 seconds;
= 100/50
=2 m/s
= velocity after 100sec
=zero
Velocity with time table is given below :
V 0 2 0
t 0 50 100
Refer the attachment for the Displacement time graph and velocity time graph

Answer 2

From the graph

(1) initial velocity, u=0

(2)velocity after 50s,v=displacement/time

V=100/5=2ms^-1

(3)velocity after 100s,V=displacement/time

V=0/100=0

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