A stone from the edge of the balcony of a building makes a free fall motion to the ground, placing i

gt^2

Your idea is okay, but gt 2=

Each segment is added, so it's 6

x=1 2at*t The three periods of time are t 2t 3t, and the total displacement ratio is 1:4:9, so the ratio of each segment is 1:3:5 to calculate the answer.

x=1 2at*t The three periods of time are t 2t 3t, and the total displacement ratio is 1:4:9, so the ratio of each segment is 1:3:5 to calculate the answer.

Someone else's answer.

Choose C1Preview questions for this lesson:

1) The following statement about force is incorrect ( ).

A force has a force object, not necessarily a force object.

B forces only occur between objects that are in contact with each other.

If the magnitude and direction of the C-force are the same, the effect must be the same.

Two forces of equal magnitude acting on the same object must have the same effect.

2) As shown in the figure, A, B, C three objects are stacked on the table, and a force F is added on top of A, then the C object is subjected to a vertical downward force in addition to its own gravity

A1 force; B2 forces;

C3 forces; D4 forces. (

3) When the object is moving, if its acceleration is constant, the object:

A must move in a uniform linear line;

B must do linear motion;

C may do curvilinear movements;

D may do circular motion.

4) A stone moves in free fall from the edge of the balcony of the building, reaches the ground, divides its time in the air into three equal segments, and if its displacement in the first period is , then its displacement in the third period is ( ).

A B C D

5) The following statement about inertia is correct ( ).

A: Only objects that are at rest or moving in a straight line at a uniform speed have inertia.

B. An object that does variable speed motion has no inertia.

C has no inertia for some objects.

If two objects have equal mass, then their magnitude of inertia is equal.

Answers to the preview questions for this lesson:

1)、BCD (2)、A (3)、C (4)、C (5)、D

Uniform acceleration theorem, the displacement ratio is 1:3 in the same time; 5；7:9 Judge C accordingly

The free fall formula 1 2gt 2, the first displacement is, let the time t, then there is 1 2gt 2=, then bring 2t into to obtain the displacement of the first period and the second time as, the same total displacement is , (is obtained by bringing 2t and 3t into respectively), so the third displacement is.