A4000 kg elephant is riding a bike at 4.0 m/s. a zebra runs out and the elephant has to slam its breaks. if the bikes breaks exert a force of 1400 n how far will it take the bike to stop

Two red blood cells each have a mass of 9.0 multiply.gif 10-14 kg and carry a negative charge spread uniformly over their surfaces. the repulsion arising from the excess charge prevents the cells from clumping together. one cell carries −2.50 pc of charge and the other −3.10 pc, and each cell can be modeled as a sphere 7.5 μm in diameter. (a) what speed would they need when very far away from each other to get close enough to just touch? assume that there is no viscous drag from any of the surrounding liquid. answer is: 321 m/s how do i find this (b) what is the maximum acceleration of the cells in part (a)? answer is: 1.38e+10 m/s2 how did they find this answer

Because light travels in a straight line and casts a shadow, isaac newton hypothesized that light is

What’s #16 asking me and how do i solve it?