Answers

2015-12-31T13:31:42+05:30
Power = 40 kW = 40000 W , Force = 20,000 N 
As, Power= force x velocity 
       ∴  40,000 = 20,000 x v
        ⇒ v = 40,000/ 20,000
        ⇒ v = 2 m/s
Therefore at the speed of 2 m/s speed can raise a loud of 20,000 N. 
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2015-12-31T14:37:33+05:30
Power = 40 kw = 40 * 10³ w
And force = 20 * 10³ N
Now we know that power = force * velocity
So, velocity =  power / force
velocity = 40 * 10³ / 20 * 10³
∴ velocity = 2 m/s
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