Gravity could act on an object
Answer:
360 km/h
Explanation:
Velocity =Distance/time ⇒ distance = velocity×time
Distance for 1st 2 h = 400×2 = 800 km
Distance for next 1 h = 300×1 = 300 km
Distance for last 2 h = 350×2 = 700 km
Therefore total distance traveled = 1800 km
So average speed = 1800/5 = 360 km/h
The instant it was dropped, the ball had zero speed.
After falling for 1 second, its speed was 9.8 m/s straight down (gravity).
Its AVERAGE speed for that 1 second was (1/2) (0 + 9.8) = 4.9 m/s.
Falling for 1 second at an average speed of 4.9 m/s, is covered <em>4.9 meters</em>.
ANYTHING you drop does that, if air resistance doesn't hold it back.
To solve this problem we will apply the linear motion kinematic equations, specifically the concept of acceleration as a function of speed and time, as well as Newton's second law.
PART A) Acceleration can be described as changing the speed in a period of time therefore,
Force is the proportional change between mass and acceleration therefore
PART B) We will apply the same concept given but now we will change the time to 21s therefore:
Now the force