Kopnięta poziomo piłka o masie 1,5 kg 1,5 kg w momencie kopnięcia uzyskała przyspieszenie 5 m s 2 5ms2 . Oblicz wartość siły kopnięcia. Po nasiąknięciu wodą masa piłki wzrosła do 2 kg 2 kg . O ile większej siły musi użyć zawodnik, aby nadać jej takie samo przyspieszenie jak poprzednio?

1) 7.5 N

2) 10 N

Explanation:

1)

We can solve this first part of the problem by using Newton's second law of motion, which states that the net force on an object is equal to the product between its mass and its acceleration:

where

F is the net force

m is the mass of the object

a is its acceleration

In this problem we have:

m = 1.5 kg is the mass of the ball

is the acceleration

So, the kick force on it was:

2)

In this case, the mass of the ball has increased to

m' = 2 kg

We can also solve this part by using again Newton's second law of motion:

where

F' is the new kick force

m' = 2 kg is the new mass of the ball

a is the acceleration

The acceleration is the same as before,

Therefore, the new kick force is:

answer: the exterior temperature of commercial jet planes as they leave the stratosphere and return to the ground increases steadily.

explanation:

the lower most layer of atmosphere is troposphere which extends from 0 to 12 km above the surface of the earth. the temperature initially decreases as distance is increased from the earth's surface. commercial jets fly in lower part of the stratosphere. the stratosphere extends upto 50 km. the temperature in stratosphere starts rising again due to presence of ozone which traps the uv rays.

thus, when the planes leave the stratosphere and return to the ground, the exterior temperature increases steadily.