The speed of the bullet before it struck the lumber.
Answer to Problem 19PP
Explanation of Solution
Given:
The mass of the bullet,
The mass of the stationary piece of lumber,
The bullet embeds itself in the wood and then both the lumber and bullet fly off at the speed,
Formula used:
Momentum of an object of mass m and moving with velocity v is given by,
And, law of conservation of linear momentum: Momentum is conserved in a closed and isolated system and is given by,
Calculation:
Consider the bullet and wood as a system, then it will be a closed and isolated system and law of conservation of momentum can be applied to it.
Now, since the lumber was stationary initially, thus initial velocity of lumber is,
Let, the speed of the bullet before it struck the lumber be
Using given values in above,
Conclusion:
Thus, the speed of the bullet before it struck the lumber is
Chapter 9 Solutions
Glencoe Physics: Principles and Problems, Student Edition
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