physics help need done soon please ?

An 8 g bullet is fired into a 319 g block that

is initially at rest at the edge of a frictionless

table of height 1.1 m. The bullet remains in

the block, and after impact the block lands

1.7 m from the bottom of the table. Find the initial speed of the bullet. The

acceleration due to gravity is 9.8 m/s ^2

.

Answer in units of m/s.

A 4.15 g bullet is fired vertically into a 1.98 kg

block of wood.

The bullet gets stuck in the block, and the

impact lifts the block 0.074 m up. (That is,

the block — with the bullet stuck in it — rises

0.074 m up above its initial position, and then

falls back down.)

Given g = 9.8 m/s ^2

. What was the initial

velocity of the bullet?

Answer in units of m/s

A rocket is fired vertically upward. At the

instant it reaches an altitude of 2720 m and a

speed of 296 m/s, it explodes into three equal

fragments. One fragment continues to move

upward with a speed of 250 m/s following the

explosion. The second fragment has a speed

of 476 m/s and is moving east right after the

explosion.

What is the magnitude of the velocity of

the third fragment?

Answer in units of m/s.