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Per NCERT Example 4.5, when a billiard ball strikes the wall normally at speed u and reflects at speed u, the impulse on the ball is which?
A0 (no change)
B2 m u (away from wall)
Cm u² (sideways)
Dm u (away from wall)
Answer & Solution
Correct answer: B. 2 m u (away from wall)
NCERT Ex 4.5: Δp = m u − (−m u) = 2 m u along the outward normal.
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