What is a mechanism?​

How much work is done lifting a 9.10 kg box straight up onto a shelf that is 1.80 m high?

Ineed the answer to question 1 , i’m desperate

(01.02 mc) nicole pushes her bike up a hill. overhead, the sun exerts a gravitational force on earth. which statement is true about the bike and earth? they both experience contact forces. they both experience non-contact forces. the bike experiences a non-contact force and earth experiences a contact force. the bike experiences a contact force and earth experiences a non-contact force. they both experience non-contact forces.