Physics, 06.07.2019 23:30 trellizzz

Arock is dropped from a bridge. what happens to the magnitude of the acceleration and the speed of the rock as it falls? a) both acceleration and speed increase b) both acceleration and speed remain the same c) acceleration increases & speed decreases d) acceleration remains the same & speed increases

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Answer from: MarsBars8798

The acceleration of the rock remains the same while the speed increases as the rock moves downwards.

The motion of an object dropped from a certain height is affected by Earth's gravitational influence.

The acceleration due gravity on the object will be constant throughout the motion. The direction of this acceleration due to gravity is downwards.

The object's speed increases as the object moves downwards and it will eventually become maximum before the object hits the ground.

The direction of the object's speed is always in the direction of the object's motion.

Thus, we can conclude that the acceleration of the rock remains the same while the speed increases as the rock moves downwards.

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Answer from: anthonybowie99

If a rock is dropped from a bridge, its acceleration remains the same (9.8 m/s², the acceleration of gravity on Earth, no matter how heavy the rock is), and its speed increases at the rate of (9.8 meters per second for every second it falls).

Answer from: Quest

W= fd
where f is an applied force and d is the distance over which it is applied. when a parachuting skydiver is at constant velocity, he is experiencing "terminal velocity", the point at which his acceleration down is canceled out by air resistance. that means that the resisting force of the air is equal to his weight, but in the opposite direction. with this, we can solve for the work done by the force.
w = fd
w = (92.0)(9.81 m/s^2) (325)
w= 2.93 x 10^5 j
the value for work in this case is positive because it is pushing up on the skydiver, who has a downward force of gravity.
therefore the answer is 2.93 x 10^5 j

Answer from: Quest

the answer you are looking for is d. there are no holes for blood to enter or leave the system. your welcome

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