If an object is only affected by gravity, then A. It's possible to do curvilinear motion B. It can only move in a straight line at a constant speed C. It's impossible to change speed D. May remain stationary

If an object is only affected by gravity, then A. It's possible to do curvilinear motion B. It can only move in a straight line at a constant speed C. It's impossible to change speed D. May remain stationary

If an object is only subject to gravity, it will do two kinds of motion, one is free falling motion, the other is around the earth

About gravity, the following statement is correct ()
A the attraction of the earth to an object is its gravity
B objects moving upward in the air are not affected by gravity
C the direction of gravity is always vertical down
D objects thrown out always fall to the ground, which is due to the effect of gravity
I have no doubt about this option, but why is the vertical down in option C wrong

It's vertical. Gravity is always vertical

1. The weight of the ball thrown upward is 1.2kg, and the gravity it receives is_____ If the air resistance of the ball in the process of vertical falling is 3 N, the resultant force is 0____ Bull, direction_________ When the ball is thrown upward, the air resistance will not change. At this time, the resultant force is__________ Bull, direction_____
You wrote it. I can't understand (>)

G=1.2*9.8=12.642
Gravity goes down vertically, greater than air resistance
F=12.642-3=9.642
The direction of resultant force is vertical and downward
On throw
F=12.642-3=9.642
The direction of resultant force is vertical and downward

The mass ratio of Party A and Party B is 5:4. If the gravity of Party A is 600N, what is the gravity of Party B?

G=mg
The ratio of G to m is the ratio of G
So 600 / 5 * 4 = 480n