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পিচ্ছিল বরফের উপর 1kg ওজনের একটি পাথর <mjx-container class="MathJax CtxtMenu_Attached_0" jax="CHTML" role="presentation" tabindex="0" ctxtmenu_counter="11" style="font-size: 114.2%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mn class="mjx-n"><mjx-c class="mjx-c32"></mjx-c></mjx-mn><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D45A TEX-I"></mjx-c></mjx-mi><mjx-msup><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D460 TEX-I"></mjx-c></mjx-mi><mjx-script style="vertical-align: 0.363em;"><mjx-mrow size="s"><mjx-mo class="mjx-n"><mjx-c class="mjx-c2212"></mjx-c></mjx-mo><mjx-mn class="mjx-n"><mjx-c class="mjx-c31"></mjx-c></mjx-mn></mjx-mrow></mjx-script></mjx-msup></mjx-math><mjx-assistive-mml role="presentation" unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mn>2</mn><mi>m</mi><msup><mi>s</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math></mjx-assistive-mml></mjx-container> বেগে চলার 10s পর ঘর্ষণের ফলে তেমে গেল। এখানে ঘর্ষণ বল কত?

1. A 0.2N
2. B 20N
3. C 2N
4. D কোনটিই নয়