Answer:
(a)
[tex] 37.6[/tex] J
b)
[tex] 0[/tex] J
Explanation:
(a)
[tex]m[/tex] = mass of the pumpkin = 3.2 kg
[tex]h[/tex] = height to which pumpkin is lifted = 1.2 m
[tex]W_{g}[/tex] = Work done in lifting the pumpkin
Work done in lifting the pumpkin is given as
[tex]W_{g} = mgh[/tex]
[tex]W_{g} = (3.2) (9.8) (1.2)[/tex]
[tex]W_{g} = 37.6[/tex] J
(b)
[tex]F[/tex] = Force applied on the pumpkin in vertical direction
[tex]d[/tex] = displacement in horizontal direction = 50 m
[tex]\theta[/tex] = Angle between applied force and displacement = 90
Work done in carrying the pumpkin is given as
[tex]W_{p}= F d Cos\theta[/tex]
[tex]W_{p}= F d Cos90[/tex]
[tex]W_{p}= F d (0)[/tex]
[tex]W_{p}= 0[/tex] J
