If a car accelerates at 7.5 mph/s, what would be its final speed after 5.0 seconds if its
1 answer:
Answer:
87.5mph
Explanation:
Given parameters:
Acceleration = 7.5mph/s
Starting speed = 50mph
Time = 5s
Unknown:
Final speed = ?
Solution:
Acceleration is defined as the rate of change of velocity with time:
Acceleration =
Insert the parameters and solve;
7.5 =
Final speed - 50 = 7.5 x 5
Final speed = 7.5 x 5 + 50 = 87.5mph
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Answer:
d) F
Explanation:
According to columb's law:
"The magnitude of electrostatic force between two charges is directly proportional to the product of magnitude of two charges and inversly proportional to separation between them."
If q₁ and q₂ are magnitude of two charges, d is distance between them and k is dielectric constant, then force F is given by
According to this force exerted on point charge Q is same as that of 3Q, so force point 3Q charge experience is also F
Here in order to find out the distance between two planes after 3 hours can be calculated by the concept of relative velocity
here
speed of first plane is 700 mi/h at 31.3 degree
speed of second plane is 570 mi/h at 134 degree
now the relative velocity is given as
now the distance between them is given as
so the magnitude of the distance is given as
miles
so the distance between them is 2985.6 miles