Answer:
Explanation:
Distance = 50 m
1. To find the average speed, first start the stop watch as the sprinter starts running and then stop it when he reaches the finish line.
Now note the time taken by the sprinter to run for 50 m.
The average speed of the sprinter is defined as the ratio of total distance covered to the total time taken.
Average speed = total distance / total time
2. To find the instantaneous speed, check the seed of the sprinter as he is at the finish line.
Explanation:
It is given that, the water from a fire hose follows a path described by equation :
........(1)
The x component of constant velocity, 
We need to find the resultant velocity at the point (2,3).
Let 
and 
Differentiating equation (1) wrt t as,
When x = 2 and
So,
Resultant velocity, 
v = 6.4 m/s
So, the resultant velocity at point (2,3) is 6.4 m/s. Hence, this is the required solution.
Answer:
Their velocity is 0m/s because the first box was only 10 kg and the second box was double the weight
<span>
The weight of the water displaced is the same as the total weight of the
wood block. The fact that 1/3 of the block is above the water level
does not matter if you just weigh the total block of wood , then the
weight of the total block of wood = the weight of the water displaced by
the block of wood. If you want to find density of the block of wood
that is a different question - then you need the volume of the block of
wood and the information about one- third of the total weight . I hope this helped</span>
