"Three short blasts" sound signal alerts others when a boat is backing up based on the boating safety rule. The short blast is a sound which has one second period, thus three short blasts mean three of this kind of sound. The sound signal is used for alerting anything surrounding the boat to avoid a collision.
ANSWER
0s to 3s
EXPLANATION
To find the time interval where the object was traveling more quickly, we have to find the velocity of the object during each interval.
From a position-time graph, we can obtain the velocity of the object from the slope of the graph in each interval. To find those slopes, we just have to divide the vertical difference by the time interval.
The interval from 0s to 3s:
The interval from 3s to 5s and the interval from 7s to 8s have a horizontal line, so the slope is zero and therefore the velocity is zero - meaning that the object was not moving during these periods.
The interval from 5s to 7s,
And the interval from 8s to 12s,
Two of these three velocities are negative. Negative velocity indicates that the object is moving backward.
From these velocities, the greatest one, in absolute value, is the one between 0s to 3s. During this interval, the object is moving backward but at the greatest velocity.
Answer:
acceleration of car B appears at slowing down by 16 km/h each second
Explanation:
As we know by the concept of relative acceleration
now we know that
Car A is moving with speed 100 km/h such that its speed is increasing at rate of 8 km/h each second
so acceleration of car A is given as
now car B is also moving at same speed of 100 km/h but its speed is slowing down at rate of 8 km/h each second
so acceleration of car B is negative as it is decelerating
So here we have from above formula
so acceleration of car B appears at slowing down by 16 km/h each second
The farther away we are from the surface of the earth the farther away we are from the core of gravitational force. as a result making us lighter