Which of the following physical quantities is completely conserved during an inelastic collision?
A. Linear momentum
B. Kinetic energy
C. Velocity
D. Mechanical energy
Answer: Option A
Solution (By JKSSB Mock Tests)
The fundamental law of conservation of momentum dictates that in a closed system with no external net forces, total linear momentum is always conserved regardless of the collision type. In an inelastic collision, some kinetic energy is converted into other forms of energy (like heat or sound or deformation work), meaning kinetic and total mechanical energy are explicitly NOT conserved.
Explanation:
Total 9 Ω, each side 3 Ω. Across two vertices, one side is 3 Ω in parallel with series of two sides (3+3=6 Ω). Equivalent: (3×6)/(3+6) = 18/9 = 2 Ω. Triangle resistance network.
Explanation:
Work done is given by W = F * d * cos(theta). In uniform circular motion, the centripetal force is always directed strictly towards the center of the circle, while the instantaneous displacement (velocity vector) is tangential to the circle. The angle (theta) between them is exactly 90 degrees. Since cos(90) = 0, the work done by the centripetal force is always zero.
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