Question

if mass=250kg, initial velocity=10m/s,final velocity=40m/s, required time 10s,then calculate power​

Answer 1

Answer:

$p \: = \frac{w}{t} \\ \\ p = \frac{change \: in \: kinetic \: energy}{time} \\ \\ p = \frac{ \frac{1}{2}m {v}^{2} - \frac{1}{2} m {u}^{2} }{t} \\ \\ p = \frac{ \frac{1}{2} m( {v }^{2} - {u}^{2}) }{t} \\ \\ p = \frac{ \frac{1}{2} \times 250( {40}^{2} - {10}^{2}) }{10} \\ \\ p = 25 \times 750 \\ \\ p = 18750 \: w \\ \\ p = 18.75 \: kw$