Explain how the extension of a spring is determined
1 answer:
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Answer:
option (a) 0.61 s
Explanation:
Given;
Time taken by the ball to reach the ground = 0.50 s
Let us first calculate the distance through which the ball falls on the ground
from the Newton's equation of motion, we have
where,
s is the distance
a is the acceleration
t is the time
here it is the case of free fall
thus, a = g = acceleration due to gravity
u = initial speed of the ball = 0
on substituting the values, we get
or
s = 1.225 m
Now,
when the elevator is moving up with speed of 1.0 m/s
the initial speed of the ball = -1.0 m/s (as the elevator is moving in upward direction)
thus , we have
or
or
4.9t^2 - t - 1.225 = 0
or
t = 0.612 s
hence, the correct answer is option (a) 0.61 s
Answer:
Car's displacement is 20 miles
Explanation:
The shortest path covered by a particle is called its displacement. It is given that, a car drives 16 miles south and then 12 miles west.
From the attached figure, OA = 12 miles
OB = 16 miles
So, their resultant is equal to the displacement, i.e. AB. So,
AB = 20 miles
So, the car's displacement is 20 miles. Hence, this is the required solution.
