Class 9
Subject ; Science
3 marks question
1.
Derive the third equation of motion, V2
= u2 + 2as graphically.
2.
An object of mass 40kg is raised to a height of
5m above the ground .What is its potential energy ?If the object is allowed to
fall, find its kinetic energy when it is half way down.
3.
A sound source produces 40 crests and 40 troughs
in 0.4s. Find the frequency of the wave.
4 marks q
1.
A stone is allowed to fall from the top of a
tower 100m high and at the same time another stone is projected vertically
upwards from the ground with a velocity of 25m/s. Calculate when and where the
two stones will meet.
2.
Draw a
well labeled diagram of human ear. Explain its working.
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