A particle with rest mass m travels with speed 0.50c. (11.3) (a) Calculate the relativistic momentum of the (4) particle, in terms of m and c, as measured by a stationary observer. (b) Determine how quickly, in terms of c, the particle must travel if it is to double its relativistic momentum from (a). c) Determine how quickly, in terms of c, the particle must travel if it is to triple its initial relativistic momentum from (a).