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1.
a) A ball is thrown upward with a speed of 5ms-! from a top of 100m building as
shown in Fig. Q1(a). One second later a ball B is thrown upward with a speed of
20ms-1 from the ground. Calculate the time after ball A is thrown and the height
from the ground when the two balls meet.
-1
5ms"
A
20ms
Fig. Q1(a)
100m

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