a)The average acceleration of the car is
b) The distance travelled is 560 m
<u>Explanation:
</u>
a) Acceleration is defined as the rate of change in velocity per unit time. So it can be obtained by measuring the ratio of speed to time.
Since here the initial speed was zero and final speed is given as 28 m/s, then time is given as 20 s. So,
b) As the speed is given as 28 m/s, then
So the distance travelled is 560 m and average acceleration is .
Answer: it’s B -3x-5
Explanation: just answered it and got it correct.
Answer:
.
Explanation:
Because the track is level and frictionless, the net force on this car-load system will be zero in the horizontal direction. As a result, (by Newton's Second Law of mechanics,) the total momentum of this system in the horizontal direction will stay the same.
Momentum of the car-load system in the horizontal direction, before contact:
- Car: .
- Load: zero (for it is dropped "vertically.")
Combine the two parts to obtain: .
Because the load stays on the car, the car and the load should have the same horizontal velocity after contact. Let denote that velocity. Momentum of the system after contact:
- Car: .
- Load: .
Combine to obtain:
.
Because the total momentum of the system will stay the same:
.
Solve for to obtain:
.
In other words, the new velocity of the system would be .
Krypton is the least metallic. Because it is a noble gas. The elements go from left to right in order of most to least metallic. Krypton is the farthest right out of all of the elements you listed.
That would be known as the rifling. Helps to make the gun shoot accurately.