e instantaneous position of an object is specified by its position vector leading from a fixed origin to the location of the object modeled as a particle. Suppose for a certain object the position vector is a function of time, given by r- 4i+ 3j- 1t k, where ř is in meters and t is in seconds (a) Evaluate of/dt. k) m/s (b) What physical quantity does dr/dt represent about the object? O the acceleration vector O the displacement vector O the velocity vector

e instantaneous position of an object is specified by its position vector leading from a fixed origin to the location of the object modeled as a particle. Suppose for a certain object the position vector is a function of time, given by r- 4i+ 3j- 1t k, where ř is in meters and t is in seconds (a) Evaluate of/dt. k) m/s (b) What physical quantity does dr/dt represent about the object? O the acceleration vector O the displacement vector O the velocity vector