Answer:
to be an eginere u would have to go to college and study hard
Explanation:
First, convert all the km/hr into m/s
You will get that
initial speed = 20 m/s
Initial speed of Green train = 40 m/s
Initial separation = 950 m
Velocity of approach = 20 - -40 = 60 m/s
relative acceleration = -4 m/s^2
v = u + at
0 = 60 - 4t
t = 15s
s = ut + 1/2 *at * t
s = 60 * 15 - 1/2 *4 * 225
s = 900 - 450
Separation when they stop = 450 m
hope this helps
Answer:
A) yes
Explanation:
First section of trip: 30 miles in 40 minutes
Second section of trip: 15 miles in 20 minutes
The formula for speed is distance over time 
Calculate the speeds for each section of the trip.
First:
k = d/t
k = 30miles/40minutes <= reduce fraction by 10 (30÷10 and 40÷10)
k = 3 miles / 4 minutes
Second:
k = d/t
k = 15miles/20minutes <= reduce fraction by 5 (15÷5 and 20÷5)
k = 3 miles / 4 minutes
Therefore there is a constant speed because both sections of the trip are driving at "3 miles / 4 minutes".
3 miles / 4 minutes can be also formatted as:
0.75 miles per minute.
<u>Answer:</u> The density of boat is 
<u>Explanation:</u>
To calculate the volume of boat, we use the equation:

where,
V = volume of boat
l = length of boat = 2.00 cm
b = breadth of boat = 11.0 cm
h = height of boat = 11.0 cm
Putting values in above equation, we get:

- To calculate density of a substance, we use the equation:

We are given:
Mass of boat = 213 g
Volume of boat = 
Putting values in above equation, we get:

Hence, the density of boat is 