# physics

A 1000 kg car can accelerate from rest to a speed of 25 m/s in 10 s. What average power must the engine of car produce in order to cause this acceleration? Neglect friction losses

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1. M*g = 1000 * 9.8 = 9800 N. = Wt. of car.
a = 25/10 = 2.5 m/s^2.

d = 0.5a*t^2 = 1.25*10^2 = 125 m.

P = F * d/t = 9800 * 125/10 = 122,500J/s = 122,500 Watts.

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2. First find k.E=1/2mv'2
K.e=1/2 1000x (25)2=
E=312500 j
Now
P=E/t
P=312500/10=31250
Now convert in kilo
31250/1000=31.25 thanks

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3. Answer given by nazish is correct.

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