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A body of mass 5 kg is moving with a velocity of 10 m/s. Now a force which delivers a constant power of 75 watt is applied on it for 10s in the same direction. The velocity of body after 10s will be? Kindly also explain, and it would be wonderful if you could glance at what I worked out and point out my flaw. This is what I thought : KE gained = 75 watt * 10 sec = 750J => momentum gained = (2m*KE)^(1/2) = (2*5*750)^(1/2) = 7500^(1/2) Force = delta p / delta t = 50{3^(1/2)} => accelaration = 50{3^(1/2)} / mass = 10{3^(1/2)} =>velocity = u + at = 10 + 10{3^(1/2)} * 10 This doesn't match any options


A body of mass 5 kg is moving with a velocity of 10 m/s. Now a force which delivers a constant power of 75 watt is applied on it for 10s in the same direction. The velocity of body after 10s will be?

Kindly also explain, and it would be wonderful if you could glance at what I worked out and point out my flaw.

This is what I thought :

KE gained = 75 watt * 10 sec = 750J

=> momentum gained = (2m*KE)^(1/2) = (2*5*750)^(1/2) = 7500^(1/2)

Force = delta p / delta t = 50{3^(1/2)}

=> accelaration = 50{3^(1/2)} / mass = 10{3^(1/2)}

=>velocity = u + at = 10 + 10{3^(1/2)} * 10

This doesn't match any options


Grade:10

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