Aproton is moving at 425 m/s. (a) how much work must be done on it to stop it? (a proton has a mass of 1.67×10−27 kg.) (b) assume the net braking force acting on it has magnitude 8.01×10−16 n and is directed opposite to its initial velocity. over what distance must the force be applied? watch your negative signs in this problem.

a)1.51*10^-22joules b) 1.89*10^-7m

Explanation:

Work done to stop the proton = the kinetic energy of the proton = 1/2 mv^2 = 1/2* 1.67*10^-27* 425*425 = 1.51* 10 ^ -22 joules

b) net force acting to stop the proton = 8.01*10^-16

Work done needed to stop the proton = net force acting opposite the motion * distance

Distance covered = need work done/ net force

Distance = 1.51*10^-22/8.01*10^-16= 1.89*10^-7m

the answer is kevlar