Kinetic Energy of 2kg Sinker Thrown from Bridge

[pat666]

Homework Statement

A 2kg sinker is thrown with a vertical velocity of 10m/s from a bridge into a river 12m below. What is the kinetic energy of the sinker when it hits the river??


Answer is 3.4*10^2 J

Homework Equations

KE = 1/2mv^2

The Attempt at a Solution

tried substituting directly into KE = 1/2mv^2 but obviously not write ant help would be appreciated.

 

[Hootenanny]

Homework Statement

A 2kg sinker is thrown with a vertical velocity of 10m/s from a bridge into a river 12m below. What is the kinetic energy of the sinker when it hits the river??


Answer is 3.4*10^2 J

Homework Equations

KE = 1/2mv^2

The Attempt at a Solution

tried substituting directly into KE = 1/2mv^2 but obviously not write ant help would be appreciated.

Okay, so when the 'sinker' is thrown you've worked out that it has kinetic energy, but is that the only type of energy it has?