3) A ball falls off a table and reaches the ground
in I sec.
Assuming 9: lom/s?, calculate it's speed on reaching
the ground and the height of a table
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Answer:
Initial velocity u=0 Let final velocity is v and height is h.
Using v=u+at
⇒v=0−10×1=−10m/s
Using s=ut+
2
1
at
2
⇒−h=0×1−
2
1
×10×1
2
⇒h=5m
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