Answer:
You are right correct option is D.
Answer:
(a) 23 m/s, -4 m/s²
(b) Speed is decreasing.
Explanation:
The velocity of the object is given as:
v(t) = 27 - t²
When t = 2 secs, velocity, v(2) becomes:
v(2) = 27 - (2)²
v(2) = 27 - 4
v(2) = 23 m/s
The acceleration is the first derivative of the velocity, dv/dt:
a(t) = dv(t)/dt = -2t
Acceleration after 2 secs, a(2) is:
a(2) = -2*2
a(2) = -4 m/s²
(b) When velocity and acceleration have opposite signs, it means that the velocity and acceleration are in opposite directions, hence, the object is slowing down.
In other words, the speed is decreasing.
Angles will probably be 96° 35° and 49°
I tried to explain it with the working out, just re arrange the cosine rule for angles instead of side lengths.
if you need it explaining at all just message me :)
hoped it helped
Convergent boundaries: the tectonic plates move toward each other
Divergent boundaries: the tectonic plates move away from each other
Hello.
The answer is
<span>Scientific knowledge can answer all of society's questions.
</span>
All Science has limits, some things sciencets cant do things becuase its not possible or its just not for science.
It cant be the first one becasue everyone chnages there mind.
It cant be two becasue sciencet only do experments that are safe so they wil be durable.
So its C
Have a nice day
