Question

A force of 100N is applied on an object of mass 15kg moving at a velocity

of 10m/s for 10 second find the final velocity of the object​

Answer 1

Answer:

49500j

Explanation:

Acceleration a = F/m = 100/10= 10ms-2

Final velocity v = u + at = 10+ 10×9= 10+90= 100ms-1

Initial kinetic energy= 0.5×mu2  

= 0.5× 10×10××10 =500J

Final kinetic energy = 0.5×mv2  

= 0.5×10×100×100= 50000J

Change in kinetic energy = 50000-500= 49500J

Answer 2

Answer:

v=76.66 m/s

Explanation:

Force = mass * acceleration, so 100= 15 *a

a = 20/3 m/s^2

so by 1st quation of motion

v = u +at

v = 10 + 20/3 *10

v =76.66 m/s