A rock is thrown vertically into the air. At the top of its path the net force o

Question

A rock is thrown vertically into the air. At the top of its path the net force on it is A) mg. B) less than mg. C) more than mg. An 80-km/h airplane flying against a 10-km/h head wind has a groundspeed of A) 90 km/h. B) 70 km/h. C) 80 km/h. D) 10 km/h. Scotty Sky diver of mass 100 kg experiences air resistance of 500 N, and an acceleration of about A) 0.3 g. B) greater than 0.5 g. C) 0.4 g. D) 0.2 g. E) 0.5 g. A 10-kilogram block is pushed across a horizontal surface with a horizontal force of 20 N against a friction force of 10 N. The acceleration of the block is A) 2 m/s^2. B) 1 m/s^2. C) 10 m/s^2. D) 5 m/s^2. E) none of the above If vertically falling rain makes slanted 45 degree streaks on the side windows of a moving car. the speed of the car A) equals the speed of the falling drops. B) exceeds the speed of the falling drops. C) is less than the speed of the falling drops. D) need more information While you stand on the floor you are pulled downward by gravity, and supported upward by the floor. Gravity pulling down and the support force pushing up A) do not make an action-reaction pair of forces. B) make an action-reaction pair of forces. C) need more information While a car travels around a circular track at a constant speed, its A) velocity is zero. B) inertia is zero. C) acceleration is zero. D) none of the above An object covers a distance of 8 meters in the first second of travel, another 8 meters during the next second, and 8 meters again during the third second. Its acceleration is A) 8m/s^2. B) 0 m/s^2. C) 24m/s^2. D) 5m/s^2.

Explanation / Answer

option c is correct

because when a rocket is thrown vertically upwards its has a force more than mg at its top inorder to overcome the weight of the rocket.

see its very simple if rockets upward is equal to weight mg then the rocket wont move upward. hence the rocket net force on its top is more than mg inorder to have a upward motion

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