Hi guys! :) I really need help on this!! Will def mark brainliest
A certain radio wave has a frequency of 3.0 x 10^7 Hz, what is its wavelength?

Karen is running forward at a speed of 9 m/s. she tosses her sweaty headband backward at a speed of 20 m/s. the speed of the headband, to the nearest whole number relative to a stationary observer watching karen

Aman throws a football straight into the air. as it rises, it slows down. which type of energy is the football gaining?

Assume you measured the mass of the cart to be (500 ± 1) g and the mass of the additional mass you put on the cart to be (500 ± 1) g as well. since the scale you are using in the lab cannot measure objects heavier than 600g you will have to sum up individual pieces and propagate the error. so what would be the mass and the standard error of the cart and the mass