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## Homework Statement

Ima Scaarred (m=56.2 kg) is traveling at a speed of 12.8 m/s at the top of a 19.5-m high roller coaster loop.

**a.**Determine Ima's kinetic energy at the top of the loop.

**b.**Determine Ima's potential energy at the top of the loop.

**c.**Assuming negligible losses of energy due to friction and air resistance, determine Ima's total mechanical energy at the bottom of the loop (h=0 m).

**d.**Determine Ima's speed at the bottom of the loop.[/B]

## Homework Equations

PE=MGH

KE=0.5*MV^2[/B]

## The Attempt at a Solution

i tried to find b

pe=0.5*56.2*12.8

=14,027.52

help me understanding the question.

the answers are.

- Show Answer

**a.**4.60 x 103 J

**b.**1.07 x 104 J

**c.**1.53 x 104 J

**d.**23.4 m/s