Asked by joe
A 15 g bullet strikes and embeds in a 2.8 kg block suspended at the end of a 1 m string. After the collision the string rises to a maximum angle of 20 degrees to the vertical.
what is the speed of bullet?
what is the speed of bullet?
Answers
Answered by
bobpursley
figure how high the blocks/bullet went.
then figure potential energy (mgh) it increased. That is equal to the initial KE of the block/bullet
figure the velocity of the block/bullet from the KE.
Now,having the initial veloctiy block/bullet,you can find the initial momentum of the bullet from conservation of momentum,thence its velocity.
then figure potential energy (mgh) it increased. That is equal to the initial KE of the block/bullet
figure the velocity of the block/bullet from the KE.
Now,having the initial veloctiy block/bullet,you can find the initial momentum of the bullet from conservation of momentum,thence its velocity.
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