Question

a bullet of mass 20g traveling horizontally at 100m/s embedded itself in the center of block of wood mass 1kg which is suspended by a light vertical string of length

Answer 1

incomplete but if the rest of the questions is "... by a light vertical string of length 1m. calculate the maximum inclination of the string to the vertical"

Then the answer is:

Conservation of linear momentum applies to the embedding process. Use that to calculate the velocity at impact, before swinging begins.

Then use that velocity and conservation of energy to calculate how high it swings.

V = sqrt (2 g H) and the height that is reaches is
H = L (1 - cos A)

Use that to solve for the maximum incination angle A

Answer 2

Solve