A 1 or 2 electrons because it is the brainless answer
Given parameters:
Displacement = 8km
Velocity = 3.8km/h
Unknown:
time = ?
Solution:
Velocity is displacement divided by time.
Velocity =
Displacement = velocity x time
Input the parameters:
8 = 3.8 x time
Time = = 2.1s
The time taken is 2.1s
Answer:
<em>Correct answer: 2) 2p</em>
Explanation:
<u>Momentum</u>
Momentum is a measurement of mass in motion or how much mass is in how much motion. The symbol for momentum is p and is defined as:
p = m . v
Where m is the mass of the object and v is the speed. Note this is the scalar version of the formula because both p and v are vectors.
Suppose the mass of the object is doubled to 2m, then the new momentum is:
p' = (2m) . v = 2 m . v
Or, equivalently:
p' = 2p
Correct answer: 2) 2p
The truck has more inertia, it is bigger/heavier so it would take a lot more force to get it to change its speed/direction
This question was apprently selected from the "Sneaky Questions" category.
The store is 3 km from his home, and he walks there with a speed of 6 km/hr. So it takes him (3 km) / (6 km/hr) = 1/2 hour to get to the store.
That's 30 minutes. So the whole part-(a.) of the question refers to only that part of the trip, and we don't care what happens once he reaches the store.
a). Over the first 30 minutes of his travel, Greg walks 3.0 km on a straight road, and he ends up 3.0 km away from where he started.
Average speed = (distance/time) = (3.0 km) / (1/2 hour) = <em>6.0 km/hr</em>
Average velocity = (displacement/time) = (3.0 km) / (1/2 hour) = <em>6.0 km/hr</em>
There's probably some more questions in part-(b.) where you'd need to use Greg's return trip to find the answers, but johnaddy210 is only asking us for part-(a.).