Answer:
option c
Explanation:
Kinetic energy is due to the speed of a body.
When speed is doubled, the kinetic energy is quadruple.
From third equation of motion, braking distance is also proportional to square of speed. Thus, when speed is doubled, the braking distance is quadruple.
Thus, option c is correct.
<u>Answer;</u>
<em>D. The object’s weight changes, but its mass stays the same.</em>
<u>Explanation;</u>
- Mass is the amount of matter in a object, which is measured in kilograms. Mass of an object is measured using a beam balance. It is important to note that the mass of an object or a body remains constant, and does not vary from one place to another. For instance the mass of a person on the moon will be the same as when the person is on the earth surface.
- Weight on the other hand is the measurement of gravitational pull of an object. weight is measured using a spring balance and measured in Newtons. Weight varies from one place to another depending on the gravitational pull of a given surface.
Answer:
The expression for the time taken by an object to move with a speed at some distance is,
t=<u> </u><u>d</u><u>/</u><u>v</u>
Here, t is the time taken by the opponent to react, d is the length of the court, andis the speed of the ball.
Explanation:
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Explanation:
force = mass × acceleration
Solving for acceleration:
acceleration = force / mass
To find the acceleration, divide each force by the mass. For example:
a = 480 N / 62 kg
a = 7.74 m/s²
