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1 answer:
When an object is having variable velocity then we can use the definition of acceleration to find it that rate of change in velocity is known as acceleration.
We can define it as
here
= final velocity
= initial velocity
= time interval
now it is given here that final velocity is less than initial velocity after some time which means
so here we can say acceleration will have negative value which shows it is opposite to the direction of velocity.
So this is the case of decreasing velocity which is known as <u>deceleration</u>.
So correct answer is
<u>deceleration</u>
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Answer:
λ = 1.388 x 10⁻⁶ m = 1388 nm
Explanation:
We can use the Young's Double Slit experiment formula here to solve this numerical:
where,
λ = wavelength = ?
Δx = distance between adjacent bright fringes = 1.62 cm = 0.0162 m
d = slit separation = 0.24 mm = 0.00024 m
L = distance from screen to slits = 2.8 m
Therefore,
<u>λ = 1.388 x 10⁻⁶ m = 1388 nm</u>
Explanation:
It is given that,
Initial speed of a golfer, u = 29 m/s
If it travels the maximum possible distance before landing. It means that it is projected at an angle of 45 degrees.
(a) We need to find the time spent by the ball in the air. It can be calculated by using second equation of motion.
Here,
a = -g
s = 0 (it is displacement and it is equal to 0 as the ball lands on the green).
So,
So, it will take 4.184 seconds in the air.
(b) let x is the longest hole in one that the golfer can make if the ball does not roll when it hits the green. It can be given by :
Hence, this is the required solution.
Answer: 2.74
Explanation:
We can solve this problem using the stopping distance formula:
Where:
is the distance traveled by the car before it stops
is the car's initial velocity
is the coefficient of friction between the road and the tires
is the acceleration due gravity
Isolating :
Solving:
This is the coefficient of friction