James is given a task to answer a two-part question. Answer the following: If th

Question

James is given a task to answer a two-part question. Answer the following: If the velocity of an objet doubles, the kinetic energy of the object increases by a factor of 2. increases by a factor of 4. decreas by a factor of 2. decreases by a factor of 4. (Give an explanation . Be clear and concise) A boxer "rolls with a punch" in order to decrease the average force exeted by the punch by decrease the distance over which the force acts. decrease the average force exerted by the punch by increasingthe distance over which the force acts. increase the average force exerted by the puch by decreasing the distance over which the force acts. increase the average force exerted by the punch by increasing the distance over which the force acts.(Give an explanation. Be clear and concise)

Explanation / Answer

1.a)  

Use equation,

KE = 1/2mv^2

KE1 = 1/2mv1^2

KE2 = 1/2mv2^2

v2=2v1

KE2 = 1/2m(2v1)^2 = 1/2m*4v1^2 = 4*KE1 as

Thus KE increases by factor 4.

1b) physics. If I turn away from a punch (or roll) then it will have a lesser impact compared to if I'm stationary while I absorb the punch. It's just to take some of the steam off the blow. Compare it to travelling 30 mph in a car and hitting a parked car in the rear end opposed to going 30 mph and hitting a car going 20 in the rear (going the same direction). The parked car will take more damage than the car in motion.

Thus b) decrease the average force exerted by the punch by increasing the distance over which the force acts.

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