Answer:
5.22 Ns
Explanation:
A consequence of Newton's second law of motion is that:
Impulse = change in momentum
The initial momentum = (0.145 kg) × (15.0 m/s)
The final momentum = (0.145 kg) × (-21.0 m/s)
The final momentum has a negative sign because the ball returned in an opposite direction.
Change in momentum = final momentum - initial momentum = (0.145 kg) × (-21.0 m/s) - (0.145 kg) × (15.0 m/s)
= -0.145(21.0 + 15.0) kg m/s
= -0.145 × 36.0 kg m/s
= -5.22 kg m/s
The magnitude of the impulse is thus 5.22 Ns.
Answer:
C
Explanation:
Velocity is just speed with direction
If you meant solve, the answer would be v= A times t
You see, to get rid of an variable on one side, you must do the opposite of what is being done to it, in this case, multiply because division. After this, we must do what we did to one side to the other side. This creates the equation above!
What represents acceleration on a velocity time graph is THE SLOPE OF THE GRAPH.
The slope of a velocity time graph represent the acceleration of the object, that is, the value of the slope at a particular time represent the acceleration of the object at that point in time.
Matter is radioactive and decays over time
Henri Becquerel discovered that <span>uranium salts spontaneously emit a penetrating radiation that can be registered on a photographic plate.
hope this helps</span>