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Question
4000 kg ভরের একটি ট্রাক 50 km/h বেগে চলার সময় উপর থেকে হঠাৎ 1000 kg ভরের একটি বস্তু ট্রাকের উপর ফেলা হলো । এখন ট্রাকের গতি কত হবে ?
25 km/h
40 km/h
45 km/h
50 km/h
ANSWER : 2
Descrption
<p>We know,</p><p>m<sub>1</sub>u<sub>1</sub>+m<sub>2</sub>u<sub>2</sub>=(m<sub>1</sub>+m<sub>2</sub>)×v</p><p>Here, m<sub>1</sub>=4000kg</p><p>m<sub>2</sub>=1000kg</p><p>u<sub>1</sub>=50 m/s</p><p>u<sub>2</sub>=0 m/s</p><p>v=?</p><p>From Equation,</p><p>4000×50+1000×0=(4000+1000)×v</p><p>200000+0=5000×v</p><p>v=200000÷5000</p><p>v=40 m/s</p>
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