HURRY PLEASE!! I’ll mark you as brainliest A 75-kg boy, travels at a speed of 20 m/s down the slope as shown. Assuming no frictional loss, what will be his kinetic
energy at the bottom of the slope?

Ahorizontal wire is tied to supports at each end and vibrates in its second-overtone standing wave. the tension in the wire is 5.00 n, and the node-to-node distance in the standing wave is 6.28 cm. (a) what is the length of the wire? (b) a point at an anti- node of the standing wave on the wire travels from its maximum upward displacement to its maximum downward displacement in 8.40 ms. what is the wire's mass?

4. who was the first one to measure the speed of light and conclude that it is finite? 5. who was the first philosopher who thought the speed of light is finite? 13. what is the speed of light numerically? 14. give an example of something moving faster than light 15. give an example for some particles or waves that

Achlorine atom has 17 protons and 18 neutrons. what is its mass number? what is its atomic number?