I have a few questions that I don't understand and are having troulbe with, could you please help me out? Thanxs!
What is the acceleration of a car that maintains a constant velocity of 100 km/hr for 10 seconds? (For this one don't I have to get the same units, this is how I started, but not too sure where to go afterward: (100 km/hr)(1000 km/hr)(1/3600 s)= 27.8 m/s)
What is the acceleration of a car that maintains a constant velocity of 100 km/hr for 10 seconds? (For this one, I know you have to use the formula of acceleration= distance traveled/time of travel, but I don't know what to do next or if I have to convert my numbers to get the same units)
Ten seconds after starting from rest, an object falling freely downward will have a speed of about ? (This one I don't understand, would you have to use the formula speed=distance/time?)
For the first: constant velocity is zero acceleration.
For the second: vfinal=gt g is the acceleration due to gravity
Of course, I'd be happy to help you with your questions! Let's tackle them one by one:
1. What is the acceleration of a car that maintains a constant velocity of 100 km/hr for 10 seconds?
To find the acceleration, we need to use the formula: acceleration = change in velocity / change in time. However, since the car maintains a constant velocity, there is no change in velocity. Therefore, the acceleration in this case is zero. So, the car has zero acceleration.
2. What is the acceleration of a car that maintains a constant velocity of 100 km/hr for 10 seconds?
This question seems to be the same as the first one you mentioned. I apologize if there is any confusion. As explained earlier, if the car maintains a constant velocity, there is no change in velocity, and thus the acceleration is zero.
3. Ten seconds after starting from rest, an object falling freely downward will have a speed of about?
To determine the speed of an object falling freely downward after a given time, we can use the equation of motion for free fall. The formula is:
speed = (acceleration due to gravity) x (time).
The acceleration due to gravity on Earth is approximately 9.8 m/s^2. Since the object starts from rest, its initial speed is zero. So, plugging in the values, we get:
speed = (9.8 m/s^2) x (10 s) = 98 m/s.
Therefore, ten seconds after starting from rest, the object will have a speed of approximately 98 m/s.
I hope this helps! If you have any further questions or need more clarification, please let me know.