Question

please say which machine is this​

Answer 1

Answer:

see-saw

Explanation:

A seesaw (also known as a teeter-totter or teeterboard) is a long, narrow board supported by a single pivot point, most commonly located at the midpoint between both ends; as one end goes up, the other goes down.

Answer 2

Answer:

this is not a machine at all. this is a see-saw also known as teeter-totter mostly found in parks and playgrounds. this is a swing as one goes up and other down. you can see in the picture above.