A student lifts their 5 kg backpack 2 meters off the floor. How much work does the student do on the backpack? 5/2= 2.5 J
5 x 2 = 10 W
5/2 = 2.5 W
5 x 2 = 10 J

What produces light and all other electromagnetic waves? a) the photoelectric phenomena b) heated metals c) charged particles d) radioactive samples (pls explain if you can : )

Free runners jump long distances and land on the ground or a wall. how do they apply newton’s second law to lessen the force of impact?

Which lists the fundamental forces in order, from strongest to weakest? strong nuclear, weak nuclear, electromagnetic, gravitational strong nuclear, electromagnetic, weak nuclear, gravitational gravitational, weak nuclear, electromagnetic, strong nuclear electromagnetic, gravitational, strong nuclear, weak nuclear