B) A force of 90 N is used to pull a truck 200 m along a horizontal floor. Determine the work done and the increase in K. E if there is no energy loss due to friction. ?

1 Answer

#18\ kJ# & #18\ kJ#

Explanation:

Work done to pull a truck by applying a force of #90 N# through a distance #200\ m# in the same direction

#=\text{force}\times \text{displacement in the direction of force}#

#=90\times 200#

#=18000\ Nm#

#=18\ kJ#

Since, there is no loss of energy due to friction hence the total work done on the truck will be converted into Kinetic energy (K.E.) of truck. Hence change in K.E.

#=\text{work done}=18\ kJ#