Answer:c
Explanation:
Given
object is falling Freely with an odometer
Suppose it falls with zero initial velocity
so distance fallen in time t is given by
![h=ut+\frac{1}{2}gt^2](https://tex.z-dn.net/?f=h%3Dut%2B%5Cfrac%7B1%7D%7B2%7Dgt%5E2)
here u=0 and t=time taken
![h=\frac{1}{2}gt^2](https://tex.z-dn.net/?f=h%3D%5Cfrac%7B1%7D%7B2%7Dgt%5E2)
for ![t=1 s](https://tex.z-dn.net/?f=t%3D1%20s)
![h_1=\frac{1}{2}g](https://tex.z-dn.net/?f=h_1%3D%5Cfrac%7B1%7D%7B2%7Dg)
for ![t=2 s](https://tex.z-dn.net/?f=t%3D2%20s)
![h_2=\frac{1}{2}g(2)^2=\frac{4}{2}g=2g](https://tex.z-dn.net/?f=h_2%3D%5Cfrac%7B1%7D%7B2%7Dg%282%29%5E2%3D%5Cfrac%7B4%7D%7B2%7Dg%3D2g)
distance traveled in 2 nd sec![=2g-\frac{1}{2}g=\frac{3}{2}g](https://tex.z-dn.net/?f=%3D2g-%5Cfrac%7B1%7D%7B2%7Dg%3D%5Cfrac%7B3%7D%7B2%7Dg)
for ![t=3 s](https://tex.z-dn.net/?f=t%3D3%20s)
![h_3=\frac{1}{2}g(3)^2=\frac{9}{2}g](https://tex.z-dn.net/?f=h_3%3D%5Cfrac%7B1%7D%7B2%7Dg%283%29%5E2%3D%5Cfrac%7B9%7D%7B2%7Dg)
distance traveled in 3 rd sec![=\frac{9}{2}g-2g=\frac{5}{2}g](https://tex.z-dn.net/?f=%3D%5Cfrac%7B9%7D%7B2%7Dg-2g%3D%5Cfrac%7B5%7D%7B2%7Dg)
so we can see that distance traveled in each successive second is increasing
Answer:
My least favorite is whoppers.....Trust me i love chocolate, but not when it taste like chalk......
Change minutes to hrs, divide by 60:
30 min = .50 hrs
45 min = .75 hrs
12 min = .20 hrs
----------------
total + 1.45 hrs, total travel time
:
let a = average speed for the trip
:
Write a dist equation, dist = speed * time
:
80(.5) + 100(.20) + 40(.75) = 1.45a
40 + 20 + 30 = 1.45a
90 = 1.45a
a =
a = 62.069 km/h, for the entire trip
and
90 km is the total distance
Answer:
B. 17.15 watts
Explanation:
Given that
Time = 10 seconds
height = distance = 0.7 meters
weight of sack = mg = F = 245 newtons
Power = work done/ time taken
Where work done = force × distance
Substituting the given parameters into the formula
Work done = 245 newton × 0.7 meters
Work done = 171.5 J
Recall,
Power = work done/time
Power = 171.5 J ÷ 10
Power = 17.15 watts
Hence the power expended is B. 17.15 watts
Answer:
A. Speed
Explanation:
Speed is the magnitude of velocity, which is given in the question. Velocity is a vector quantity and therefore has both a magnitude and a direction. Only the former is implied in the question.