Answer:
4/5 houses
Explanation:
The speed of the first carpenter is:
(1/5 house) / (3/4 day) = 4/15 house/day
The speed of the second carpenter is:
(2/5 house) / (3/4 day) = 8/15 house/day
Together, their combined speed is:
4/15 house/day + 8/15 house/day = 12/15 house/day
= 4/5 house/day
Per day, the two carpenters build 4/5 of a house.
<span>Newton's third law of motion (also known as lar of action-reaction) states that when an object A exertes a force on another object B, object B also exerts a force on object A equal and opposite to the first force. If we apply the law to this problem, we can say that the force exerted by the car on the horse is equal to the force exerted by the horse on the car, so its magnitude is 60 N.</span>
Answer:
v = 6.95 m/s
Explanation:
Given that,
A diver is on a board 1.80 m above the water, s = 1.8 m
The initial speed of the diver, u = 3.62 m/s
Let v is the speed with which she hit the water. It will move under the action of gravity. Using the equation of motion as follows :
So, she will hit the water with a speed of 6.95 m/s.
A=f/m
A=900/425
A=2.18
To determine acceleration you divide the force by the mass.
Answer:
The speed of the knife after passing through the target is 9.33 m/s.
Explanation:
We can find the speed of the knife after the impact by conservation of linear momentum:
Where:
: is the mass of the knife = 22.5 g = 0.0225 kg
: is the mass of the target = 300 g = 0.300 kg
: is the initial speed of the knife = 40.0 m/s
: is the initial speed of the target = 2.30 m/s
: is the final speed of the knife =?
: is the final speed of the target = 0 (it is stopped)
Taking as a positive direction the direction of the knife movement, we have:
Therefore, the speed of the knife after passing through the target is 9.33 m/s.
I hope it helps you!
