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## Homework Statement

A 55kg mass is projected vertically with and initial speed of 30m/sec

a) what is original kinetic energy

b) What is kinetic E after 4.5 seconds

c) What is chg in gravitational potential E in these 4.5seconds?

## Homework Equations

W=mv

^{2}/2

W=(m/2)(gt)

^{2}

W=mgh

## The Attempt at a Solution

a) Original =(55)(30)

^{2}/2

b) W=(m/2)(gt)

^{2}

=(55/2)[(9.8)(4.5)]

^{2}

c) W=mgh

=(55)(9.8)h