280N. Your position or state of contortion doesn't change your weight.
Artie Shaw played a Conn clarinet. His clarinet is now in the Smithsonian storage facility. Unfortunately, Conn is no longer an independent entity. It was acquired by Selmer, another company most commonly associated with Benny Goodman.
The work needed to move the shed to a platform 5m above would depend on the distance it needs to be moved horizontally and the method of moving it. The work done in lifting the shed against gravity can be calculated using the formula: work = force x distance x cos(angle), where the force is the weight of the shed (280 N), the distance is the vertical height (5m), and the angle is the angle between the force and the direction of movement (typically 0 degrees for vertical lifting).