Is muscular energy is used by us while climbing ladder

Which describes an image that can be produced by a concave lens? the image is real and smaller than the object. the image is virtual and larger than the object. the image is virtual and smaller than the object. the image is real and larger than the object.

Explain how the energy of rubber ball is tranforned as it roll down a ramp. give evidence that the energy of the og the ball remains the same at all points on the ramp

What is the measure of how much matter is in an object and that can be measured using a balance? a. height b. volume c. weight d. mass