Answer:
Answer is D. 8.04 x 10^4 J
Explanation:
1. D
2. A
3. D
4. B
5. C
6. B
7. D
8. C
9. B
10. D
All correct i promise you that
Answer:
4/3
Explanation:
Shown in the picture attached
It is because gravity is pushing down on the ball
The position of an oscillating mass is given by:

where A is the amplitude of the oscillation,
the angular frequency and t the time.
The velocity of the oscillating mass can be found by calculating the derivative of the position:

In this problem, A=2.0 cm and
, so if we substitute these data and t=0.4 s we can find the velocity at t=0.4 s:
