Answer:
d = 369.38 km
Explanation:
The speed has a x-component and a y-component.
speed,x = 2.07cos(28.8°) = 1.81 km/s
speed,y = 2.07sin(28.8°) = 1.00 km/s
The time the shell flies is determined by the y-component, when it reaches the highest point the speed is 0 due to the gravitational acceleration.
0 = 1000 - 9.8 * t
9.8 * t = 1000
t = 102.04 s
After reaching the highest point the shell takes the same time to reach the ground where it was fired, so the total time it flies is 102.04* 2 = 204.08 s
Now you can calculate the distance it moves horizontally while it flies (constant speed)
d = 1.81 km/s * 204.08 s (I used the speed in km/s because the answer needs to be in km)
d = 369.38 km
Answer:
A. Yes, when another driver makes a mistake, you will have time to react
Explanation:
Yes it is good to make space cushion between two cars because due to some urgency when front vehicle applied brakes then the driver of the rear car will definitely take some time to react.
This reaction time may be between 0.5 s to 0.8 s for different people
so the rear car will move with same speed for above reaction time and it will cover the cushion distance between two cars
If we will not maintain this cushion distance between two cars then we can see that the two cars will collide and that may cause many accidents
so it is correct statement and correct option would be
A. Yes, when another driver makes a mistake, you will have time to react
Explanation:
30km/h -->
A-----------------B
<-- 50km/h
Displacement = 0 (initial and final point are the same)
Distance=2AB
Average Speed=37.5km/h
Answer:After 2 seconds the object reach its maximum height of 80 feet.
Step-by-step explanation:
Consider the provided function.
The function is a downward parabola.
The object will reach its max height at the vertex of the parabola.
The vertex of the parabola is given by ,
Where the standard form is .
By comparing the provided function with the standard form.
a=-16, b=64 and c=16
Thus, the vertex are:
Now substitute the value of t in the provided function.
Hence, after 2 seconds the object reach its maximum height of 80 feet.
Explanation: