1. A vehicle of mass 1200Kg changes its speed from 36km/hr to 72 km/hr in 2 mins. calculate: i) the work

Answers (1)

Work \ done= force\times displacement

Force\ F=m\frac{v_2-v_1}{t}

m=1200 kg

v1=36Km/k = 10 m/s

v2=72Km/h = 20 m/sec

t = 2 min = 120 sec

F=1200\times\frac{20-10}{120}=100N

displacement

s=\frac{v^2-u^2}{2a}=\frac{300}{2\times\frac{1}{12}}=1800m

Work done

W=100\times1800=180000J=180KJ

Power

P=\frac{W}{t}=\frac{180000}{120}=1500Watt=1.5K\ Watt

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