A box slides with an initial speed of 4.0 ms4.0\,\dfrac{\text m}{\text s}4.0sm4, point, 0, start fraction, start text, m, end text, divided by, start text, s, end text, end fraction towards a spring on a frictionless horizontal surface. When the box hits a spring with spring constant k=150 Nmk=150\,\dfrac{\text N}{\text m}k=150mNk, equals, 150, start fraction, start text, N, end text, divided by, start text, m, end text, end fraction, the spring compresses by 0.30 m0.30\,\text m0.30m0, point, 30, start text, m, end text.

Fft review: linspace, fs, fftshift, nfft 1. generate one second of a cosine of w,-10hz sampled at f, = 100hz and assign it to x. define a tt as your time axis 2. take 64 points fft. 3. as you remember, the dft (which the fft implements) computes n samples of s2t where k-0,1,2, n -1. plot the magnitude of this 64-points fft at range 0 to 63, what do you think of this graph? 4â·to get the x-axis into a hz-frequency form, plot this 64-points fft between-50 to 50 (the 100hz sampling rate) and have n-points between them. 5. according to your figure, what frequency is this cosine wave at? 6. remember that the fft is evaluating from 0 to 2ď€. we are used to viewing graphs from-ď€ to ď€. therefore, you need to shift your graph. 7. now according to your shifted graph. what frequency is this at? 8. note that the spikes have long drop-offs? try a 1024-point dft. note that the peak is closer to 10 and the drop-off is quicker. although, now sidelobes are an issue

Could someone me find the answer to this problem.

You've already seen the value of 9.8 in this lesson. what's this value called? what quantity does it represent?