Answer the following questions related to mass and weight. show your work, and cancel and carry units. a. what is the weight on earth (in n) of a 100-kg body? b. what is the mass (in lbm) of 20 lbf of water on earth? c. what is the mass (in slugs) of 20 lbf of water on earth? d. how many n are needed to accelerate 2 kg at 1 m/s? ? e. how many lbf are needed to accelerate 2 lbm at 1 ft/s? ? f. how many lbf are needed to accelerate 2 slugs at 1 ft/s? ?