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Ber [7]
3 years ago
7

USE K U E S

Physics
1 answer:
nata0808 [166]3 years ago
3 0

Explanation:

Problem 1.

Initial speed of the runner, u = 0

Acceleration of the runner, a=4.2\ m/s^2

Time taken, t = 100 s

Let v is the speed of the runner now. Using the first equation of kinematics as :

v=u+at

v=at

v=4.2\ m/s^2\times 100\ s

v = 420 m/s

Problem 2.

Initial speed of the plane, u = 0

Distance covered, d = 300 m

Time taken, t = 25 s

Using the equation of kinematics as :

d=ut+\dfrac{1}{2}at^2

d=\dfrac{1}{2}at^2

a=\dfrac{2d}{t^2}

a=\dfrac{2\times 300\ m}{(25\ s)^2}

a=0.96\ m/s^2

Problem 3.

A ball free falls from the top of the roof for 5 seconds. Let it will fall at a distance of d. It is given by :

d=ut+\dfrac{1}{2}gt^2

d=\dfrac{1}{2}\times 9.8\times (5)^2

d = 122.5 meters

Let v is the final speed at the end of 5 seconds. Again using first equation of kinematics as :

v=u+gt

v=9.8\ m/s^2\times 5\ s

v = 49 m/s

Hence, this is the required solution.

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