Question

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what is the momentum of a ball of mass 20g moving with velocity of 800m/s

1. 1.6 kgm/s

2. 16 kgm/s
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free points​

Answer 1

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Initial velocity u=800m/s and velocity after travelling a distance s=100cm=1m is v=100m/s

so the acceleration, a from the equation, v 2 =u 2−2as

will be a= 2

640000−10000 =270000m/s2

so the average(because the resistance will not be uniform ) resistive force will be F=ma=0.02Kg×270000m/s 2

or F=5400Newton

Hope it helped....

Answer 2

Electric Potential is the work done per unit charge in order to bring the charge from infinity to a point in electric field while Electric potential difference is the Potential developed while moving a charge from one point to another in the field itself