Work and Energy of carnival dinner

[kaspis245]

Homework Statement

At a carnival, you can try to ring a bell by striking a
target with a 9.00-kg hammer. In response, a 0.4-kg metal piece
is sent upward toward the bell, which is 5.00 m above. Suppose
that 25.0% of the hammer’s kinetic energy is used to do the (non-
conservative) work of sending the metal piece upward. How fast
must the hammer be moving when it strikes the target, so that the
bell just barely rings?

Homework Equations

Work-Energy Theorem

The Attempt at a Solution

The answer must be 4.17 m/s

 

[CWatters]

M2 is not 4kg.

 

[kaspis245]

Thanks...