I presume that you mean 'An object travelling initally at 10m/s, accelerates at 4m/s2 for 8s; what is its final speed? If it is accelerating at 4 m/s2, it gains 4m/s every s v= u + at where v is the final speed, u is the initial speed, a is the acceleration and t is the time v = 10 + 4(8)= 42 m/s
After 3 seconds, the car would have accelerated to a speed of 25 m/s. This is calculated by adding the initial speed of 10 m/s to the product of the acceleration rate (5 m/s^2) and the time (3 seconds) elapsed.
25ms
-10
second
The time period of a second pendulum from its extreme position to its mean position is one second. A second pendulum is a pendulum with a length such that its period of oscillation is two seconds when swinging between two extremes.
The frequency would be 0.25 Hz. Frequency is the reciprocal of the period, so if the period is 4 seconds, the frequency is 1 / 4 = 0.25 Hz.
It completes 20 vibrations per second, the the period is 1/20 of a second.
If the second hand began at 12, 1200 seconds would pass in this period, or 20 minutes.
since the balloon is moving up with a constant speed it is not accelerated or decelerated
The frequency would be 0.25 Hz. Frequency is the reciprocal of the period, so if the period is 4 seconds, the frequency is 1 / 4 = 0.25 Hz.
second
The period is 1 second.
It will be 1/500 of a second = 0.002 seconds.
It completes 20 vibrations per second, the the period is 1/20 of a second.
If a wave is traveling at 5 meters per second (assuming that is what the question meant) and its wavelength is 20 meters, consider standing beside the wave and watching it pass. As the wave is 20 meters long and it is moving at 5 meters per second, it will take 4 seconds for the full cycle of the wave to pass an observer. That means its frequency is one cycle per 4 seconds. And - surprise! - that's the period of the wave. The period of the wave is 4 seconds.
6 meters per second. Explanation: After 1 second = 2 meters per second. After 2 seconds = 4 meters per second. After 3 seconds = 6 meters per second.
A skipped beat is a beat that is not in rhythm (the 2-second rhythm) whereas an accelerated heartbeat is that heartbeat that happens before the 2 seconds interval elapses, and both are a risk to the normal operation of the heart.
If the second hand began at 12, 1200 seconds would pass in this period, or 20 minutes.
there was one kind of second. it is called nanoseconds. Usually, it can be seen faster moving than a second in a timer.
The speed of the plane after 10 seconds of acceleration at 15 m/sĀ² would be 150 meters per second. This is calculated by multiplying the acceleration (15 m/sĀ²) by the time (10 seconds).