Question

A body of mass 5 kg at rest is under the action of a force which gives it a velocity given by v=3tv=3t m/s, here tt is time in seconds. The work done by the force in two seconds will be:

Answer 1

Heya Mate!!!


Given; -

Mass = 5kg
initial velocity (u) = 0
final velocity (v) = 3t m/s
t = 2 seconds


Find :-

Displacement due to action of force (s)= ?
work done (w) = ?
force = ?


Solution :-

v = 3t m/s

a = dv/dt

a = d(3t) /dt

a = 3 m/s²

Force = mass × acceleration = m×a

= 5 × 3

= 15 Newton.

For finding displacements ..

s = ut +( 1/2)at²

s = 0 + (1/2)at²...........[ u = 0]

s = (1/2)×3×2×2

s = 6m

Work done = Force . displacement

w = f. s

w = 15 . 6

w = 90 joules


HOPE IT HELPS YOU OUT..

#BEBRAINLY ♥️

Answer 2

Hola mate♥

90 joules is the answer