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Sagot :
The initial speed of the bullet is 2624.7 m/s.
- Conservation of momentum indicates that the total momentum of an isolated system remains the same in the absence of an external force. H. Momentum is neither created nor destroyed, but can be changed by the action of forces in the sense of Newton's laws of motion.
- Momentum is the product of an object's mass and its velocity, which is also equal to the total force required to keep the object at rest.
- One of the practical aspects of momentum conservation is the collision problem where momentum is conserved and the net external force remains zero.
Mass of bullet, m = 5 g = 0.005 kg
Mass of block, M = 1.2 kg
Coefficient of friction = 0.2
Distance, d = 0.31 m
Let the initial speed of the bullet is u.
Use Conservation of momentum
m u = (M + m) v
0.005 x u = (1.2 +0.005) v
v = 4.2 x 10-4 u m/s
Now, use third equation of motion
v2 = u2 - 2μg s 0 = (4.2 x 10-4 u)2 - 2 x 0.2 x 9.8 x 0.31u = 2624.7 m/s
To learn about Conservation of momentum -
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