- #1
physics(L)10
- 101
- 0
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=mv2/2
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