Make a clinometer with a micro:bit and then measure the height of some object. You can check the clinometers we made on https://twitter.com/PlusPlusInt/status/1536762461180805121.
Person image is taken from https://www.svgrepo.com/svg/398023/person-walking and building image is taken from https://www.svgrepo.com/svg/180300/building-office.