An object is moving along the x-axis. at t = 0 it has velocity v0x = 20.0 m/s. starting at time t = 0 it has acceleration ax = - ct, where c has units of m/s3. (a) what is the value of c if the object stops in 8.00 s after t = 0? (b) for the value of c calculated in part (a), how far does the object travel during the 8.00 s?

Auniform electric field exists in the region between two oppositely charged plane parallel plates separated by a distance of 1.60 cm . a proton is released from rest at the surface of the positively charged plate and strikes the surface of the opposite plate in a time interval of 3.20×10-6 s. 1-find the magnitude of the electric field. use 1.60×10-19c for the magnitude of the charge on an electron and 1.67×10-27kg for the mass of a proton 2-find the speed of the proton when it strikes the negatively charged plate