7. A body A of mass 500 g is
kept on a smooth table
A
[Fig. 1.56]. A is connected
to one end of a string, to
the other end of which a
200 cm
body B of mass 200 g is
B
attached. The string passes
over a frictionless pulley. At
Fig. 1.56
time, t = 0, A is 200 cm away from the edge of the
table and is moving with a velocity of 50 cm.s-1
towards left. Find the position and velocity of A at
t = 1s.
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Answer:
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M
B
=100gm
m
a
=6m
B
a=
m
a
+m
B
m
B
g
=
7
1
(10)m/s
2
=
7
1000
cm/s
2
μ=−90cm/s
d=100cm
d=Ut+
2
1
at
2
100=−90t+
2
1
7
1000
t
2
t=1.97sec≈2sec
v=μ+at
v=−90+
7
1000
(1.97)
v=191.42cm/sec
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