Answer:
Explanation:
A = 3m
B = 4 m
let the angle between the two vectors is θ.
the resultant of two vectors is given by

(a) R = 7 m
So, 
49 = 9 + 16 + 24 Cosθ
Cosθ = 1
θ = 0°
Thus, the two vectors are inclined at 0°.
(b) R = 1 m
So, 
1 = 9 + 16 + 24 Cosθ
Cosθ = - 1
θ = 180°
Thus, the two vectors are inclined at 180°.
(c) R = 5 m
So, 
25 = 9 + 16 + 24 Cosθ
Cosθ = 0
θ = 90°
Thus, the two vectors are inclined at 90°.
Answer:

Explanation:
Force is equal to the product of mass and acceleration.

We know the mass, but not the acceleration. Therefore, we must calculate it before we can calculate force.
1. Calculate Acceleration
Acceleration is the change in velocity over the change in time.

The final velocity is 10 meters per second and the initial velocity is 4 meters per second. The time is 1 second.

Substitute the values into the formula.

Solve the numerator.

Divide.

2. Calculate Force
Now we know the acceleration and the mass.

Substitute the values into the fore formula.

Multiply.

- 1 kilogram meter per square second is equal to 1 Newton.
- Our answer of 12 kg*m/s² is equal to 12 Newtons

The force applies to the ball was <u>12 Newtons.</u>
Answer: D
Explanation: Energy is neither created nor destroyed so the amount of reactants and products must be equal
Answer:
E. 3h
Explanation:
We know that
u = 0 m/s.
velocity after t = 1s
v = u+gt = 0+9.81 x 1s= 9.81 m/s
distance covered in 1st sec
= =>> ut+0.5 x g x t²
=>>0 + 0.5x 9.81 x 1 = 4.90m
Let 4.90 be h
distance travelled in 2nd second will now be used
So velocity after t = 1s
=>>1 x t+ 0.5 x g x t²
=>9.81x 1 + 0.5 x 9.81 x 1 = 3 x 4.90
So since h= 4.90
Then the ans is 3x h = 3h