Blake pulls a stationary 20 kg box to the right with a force of 500
N. The coefficient of friction (u)
between the block and the
ground is 0.25 as it accelerates
across the floor. What is the
acceleration in m/s?? 1.22.5475
2. 24.9875
03. 24.7548
04. 15.333
5. 20.2554
6. 20.6840
7. 24.5667
8. 22.1155

so easy. just google the electromagnetic waves and it’ll pop up.

the only real purpose of sputnik 1 was to beat the us into space. we were getting close to launching a useful satellite, explorer 1 - which launched on january 31, 1958. the ussr had to beat that, so they launched sputnik 1 on october 4, 19