Reference no: EM132194645

Question: You are driving your truck down a small street at 30 mph (13.4 m/s). Approaching a stop sign, you put on the brakes and come to a stop 10 seconds later. (Friction can be neglected here because the truck is rolling.)

For the following two questions, SKETCH a diagram showing the relevant variables, motion, and quantity you are solving for. Clearly show which equations you will use, and any algebra or arithmetic. Finally, comment on whether or not your results seem reasonable.

(a) First, what is the (average) braking force of the truck? (Your car weighs about 3300 lbs, which corresponds to a mass of 1500 kg.)

(b) Second, at the hardware store, you load EIGHT 100 lb bags of sand in the back of your truck (100 lb has a mass of 45 kg). Your truck's braking force is what you calculated above. How long will it now take you to make the same stop? (I.e., you are going 30 mph and then put on the brakes. How long until you stop?)