A parachute slows a skydiver from 85 m/s to 45 m/s in 4.5 seconds? What is the
acceleration of the parachute?
A. 8.9 m/s2
B. -8.9 m/s
2
C. 0.1 m/s2
D. -0.1 m/s
2

Explanation:

Acceleration is found by dividing the change in velocity by the change in time.

The parachute slows from 85 m/s to 45 m/s. Therefore, the final velocity is 45 meters per second and the initial velocity is 85 meters per second. The time is 4.5 seconds.

Substitute the values into the formula.

Solve the numerator and subtract.

Divide.

If we round this to the nearest tenth, the 8 in the hundredth place tells us to round the 8 up to a 9.

The acceleration of the parachute is approximately -8.9 meters per square second. The value is negative because the parachute is slowing down.

it would be a gas formation

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.