Question

Add the following Expressions 3a2b + 3ab2

, -4a2b -5ab2 , 11a2b+12ab2​

Answer 1

Step-by-step explanation:

Mass = 90 kg

Initial velocity = 6 km/h

Final velocity = 12 km/h

To Find :-

Work done

Solution :-

Here,

At first converting velocity into m/s

6 × 5/18 = 30/18 = 5/3 m/s = 1.667 m/s

12 × 5/18 = 60/18 = 10/3 = 3.33 m/s

Now

We are knowing that

The change in KE is the difference between the initial KE and final KE.

So,

W = 1/2mv² - 1/2mu²

Taking 1/2 and m as common

W = m/2[v² - u²]

W = 90/2[3.33² - 1.67²]

W = 90/2[11.088 - 2.788]

W = 45[8.3]

W = 373.5 J

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