Aweightlifter lifts a 250-kg mass 0.5 meters above his head, how much peg does the mass have (note: g=9.8 m/s2)? round your answer to the nearest whole number. j

1225 J

Explanation:

The Gravitational potential energy (PEG) gained by a mass lifted above the ground is given by

where

m is the mass

g = 9.8 m/s^2 is the acceleration due to gravity

h is the height at which the object has been lifted

In this problem, we have

m = 250 kg

h = 0.5 m

So, the PE of the object is

f=ma newton

f=100x2.5=250n

d. platinum would have the greatest temperature increase because it has the lowest specific heat.