Consider a situation where a constant force of 25N acts on an object having a mass of 2kg for 3 seconds. What is the work done by the force? A) 150J
B) 50J C) 75J D) undetermined - not enough information E) none of the above
Impulse = Ft = 25 x 3 = 75 N*s
Momentum, p = mv. The 25 N force provides an acceleration of F / m
(from F = ma) = 12.5 m/s^2
For 3 s so the increase in velocity, v is a 12.5 x 3 = 37.5 m/s.
the momentum increases by a factor of 37.5.
w =mv^2/2 =1406.25 ans so option E is correct
FOR WORK DONE = F*S
HERE F IS GIVEN BUT for calculaton of S is not possible
as no initial velocity no accletration
so cant be determined
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