Steel mass attached to the ceiling, maximum height gain if it is hit

[needingtoknow]

Homework Statement

A 275 KG steel mass is held by a long cable to the ceiling. Daniel hits the steel mass horizontally and gives it a horizontal speed of 1.75 m/s. Assuming there is no friction, determine the maximum height gain, in centimetres, of the steel mass after the collision.

Homework Equations

W = Fd
E = 1/2mv^2
Eg = mgh

The Attempt at a Solution

These are the only three equations given in the question, and no angle is given in the question so how would I calculate the height at which the pendulum moves (if the question is suggesting that the steel block is moving in a pendulum fashion which I am not entirely sure of)

 

[Infrared]

Try conservation of energy. When it is at its highest point, the mass is not moving so all of its initial kinetic energy has been converted into gravitational potential energy.

 

[needingtoknow]

All right so using the law of conservation of energy here is what I got.
1/2mv^2 + mgh = 1/2mv^2 + mgh
1/2(275)(1.75) + 0 = 0 + (275)(9.8)h
240.625/2695 = h
h = 8.9 cm but the answer is 15.6 cm

 

[needingtoknow]

Oh and I used the rest position of the steel block as my reference point because they didnt give the distance off of the ground.

 

[Infrared]

Don't forget to square the velocity.

 

[needingtoknow]

Oh never mind I got the answer. Thanks for the helps HS-Scientist!

 

[needingtoknow]

Yeah just realized that! I got 15.6 cm after I fixed that.