I believe it is A bit not completely sure
Answer:
v = 0.69 m/s
Explanation:
Given that,
A ball is dropped from a height of 52 m.
The ball reaches the ground in 75 seconds
We need to find the average speed of the ball. The ball will travel a distance of 52 m in 75 s. The average speed of the ball is distance divided by time taken. So,
Hence, the average speed of the ball is 0.69 m/s.
The force of friction needed to overcome to move the box is 29.4N
According to Newton's second law;
Taking the sum of force along the plane;
This shows that the moving force is equal to the frictional force
Given that
Get the frictional force;
Since
Hence the force of friction needed to overcome to move the box is 29.4N
Learn more here: brainly.com/question/189856
No the acceleration of gravity on earth is still 9.8ms-2 unless he was on a different planet