Question

a car having mass 1200 kg is uniformly accelerated from rest and covered a distance of 40 metre is 4 seconds calculate the work done by the healing and of car during this time what is the kinetic energy of car at last​

Answer 1

here is the correct answer

Answer 2

initial u =0

s= 40m

t= 4s

using 2nd equation of mition

s=ut+1/2at^2

40=1/2×a×4×4

a=5m/s

using 1st equation of mition

v=u+at

v=5×4

v=20

F= ma

=1200×5

=6000j

W = fs

w = 6000×40

=240000j

K E= 1/2mv^2

=1/2×1200×20×20

=240000j