a level physics question. help!

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ta2kook
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#1
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#1
The speed of an air rifle pellet is measured by firing it into a wooden block suspended from a
rigid support.
The wooden block can swing freely at the end of a light inextensible string as shown in the
figure below.
initial position of block
A pellet of mass 8.80 g strikes a stationary wooden block and is completely embedded in
it. The centre of mass of the block rises by 0.63 m. The wooden block has a mass of 450
g.
(a) Determine the speed of the pellet when it strikes the wooden block.

i have been stuck on this for a while now
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0le
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#2
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#2
Think of it in terms of pendulums. When a pendulum swings back and fourth, ignoring other effects such a friction, there is a conversion between kinetic energy and gravitational potential energy.

You have a similar system here. Just treat the block on the string as a pendulum. You should then be able to get the answer to part a).
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