A bullet embeds in a wooden block initially at rest on a long string

PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

0.050\,\text{kg}

bullet embeds in a

0.95\,\text{kg}

wooden block initially at rest on a long string. After the collision, the bullet–block system swings upward and rises

0.20\,\text{m}

before momentarily coming to rest. What is the bullet’s speed just before impact? (a)

80\,\text{m/s}

(b)

40\,\text{m/s}

(c)

28\,\text{m/s}

(d)

38\,\text{m/s}