(a) A child is sliding on a sled moving at a speed of 3.8 m/s on level ground. Y

Question

(a) A child is sliding on a sled moving at a speed of 3.8 m/s on level ground. You decide to stop the sled by pulling on it in the direction opposite to its motion. If the mass of the child and sled together is 35 kg, what impulse do you need to apply to stop it? (b) If you had to pull the sled for 1.3 seconds to stop it, what average force did you apply during that time? (c) A car with a mass of 1630 kg, traveling at 35 mph, collides head-on with a truck with mass 4600 kg that is traveling at 16 mph toward the car. Their front parts crumple and they stick together. Just after the collision, what is the speed and direction of motion for the joined car and truck? (d) A 14,000 kg railroad car is rolling at a speed of 2.50 m/s. It rolls under a gravel hopper, and an 18,000 kg load of gravel is dropped in (vertically). After the gravel stops bouncing around and settles into the bottom of the car, the gravel and the car will be traveling at the same speed. What speed is that? Besides calculating the speed, explain what horizontal force(s) was/were acting on the railroad car that made its speed change.

Explanation / Answer

35 *3.8= 133 b)133/1.3= 102.30 c)

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