<span>When t=0, v=0, d=0
When t=tf, v=41m/s, d=3.5m
We have 2 formulas – the ones corresponding to uniformly accelerated linear movement:
vf=a*t+vo
d=(1/2)*a*t^2+vo*t
Let’s put the data in the formulas:
41m/s=a*t+0=a*t
3.5m=(1/2)*a*t^2+0*t=1/2*a*t^2
You can use a variety of methods to find t and a. I will choose substitution.
t=(41m/s)/a
3.5m=(1/2)*a*((41m/s)/a)^2=(1/2)*a*(41m/s)^2/a^2=(1/2)*(41m/s)^2/a
a=(1/2)*(41m/s)^2/(3.5m)=(1/2)*41^2(m^2/s^2)/(3.5m) a=41^2(m/s^2)/( 2*3.5)=240m/s^2</span>
For the first question you could devise a way to test the question to find the answer. You could create a sample of black cats, a sample of white cats, and a control sample of a both black and white cats.
<span>You would measure how much the cats eat each day. The study could be repeated or reviewed by your peers. </span>
<span>For the second question, there is currently no way to sample a person's thoughts, but even if there was a way, there would be no way to repeat the moment. It is not testable and not repeatable and thus cannot use the scientific method. </span>
<span>Calories can be measured and compared. </span>
<span>The tide can be observed until someone hypothesizes the right testable notion to determine the answer.</span>
Solid moves slightly in a fixed position
Answer:
Explanation:before the phase change the substance is a particle.
