試題詳解

6. The ballistic pendulum has mass 10 kg. A bullet of 300 g moves at the speed of v0 right before hitting the pendulum. How much is the height h that the pendulum can swing upward and rest momentarily? (Gravitational acceleration g = 10 m/s² )

(A) 6.7× v0 ²
(B) 4.2× v0 ²
(C) 3.3× v0 ²
(D) 2.3×v0 ²
(E) 5.7×v0 ²