1.A truck weighing 1000kgf changes its speed from 36km/hr to 72 km/hr in 2 mins. calculate:i) the work done by the engine .ii) its power.2. A body of mass 60kg has the momentum 3000kg m/s. Calculate:i) the kinetic energy.ii) the speed of the body

1.A truck weighing 1000kgf changes its speed from 36km/hr to 72 km/hr

1.	1.A truck weighing 1000kgf changes its speed from 36km/hr to 72 km/hr in 2 mins. calculate:i) the work done by the engine .ii) its power.2. A body of mass 60kg has the momentum 3000kg m/s. Calculate:i) the kinetic energy.ii) the speed of the body
Answer» 1. mass of truck = 1000 kg u = 36 km/h = 10 m/s v = 72 km/h = 20 m/s time = 2 min = 260 = 120 s acceleration = (v-u)/t = (20-10)/120 = 1/12 m/s² force = ma = 1000(1/12) = 1000/12 N s=(v²-u²)/2G = (400-100)/210 = 15m Work DONE = Fs = (1000/12)15 = 1250 J Power = W/t = 1250/120 = 104.1 J/s 2. mass = 60kg momentum = 3000 kgm/s KE = p²/2m = 3000²/(2*60) = 75000 J = 75 kJ velocity = p/m = 3000/60 = 50 m/s

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1.A truck weighing 1000kgf changes its speed from 36km/hr to 72 km/hr in 2 mins. calculate:i) the work done by the engine .ii) its power.2. A body of mass 60kg has the momentum 3000kg m/s. Calculate:i) the kinetic energy.ii) the speed of the body

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