Calculate the work done by a car against gravity in moving along a straighthorizontalroad . The mass of the car is 400 kg and the distance moved is 2 m .

Calculate the work done by a car against gravity in moving along a str

1.	Calculate the work done by a car against gravity in moving along a straighthorizontalroad . The mass of the car is 400 kg and the distance moved is 2 m .
Answer» Solution :Force of gravity acts on the car vertically DOWNWARD while car is MOVING along horizontal ROAD . i.e ., ANGLE between them is `90^(@)` `W =Fd cos theta` `= Fd cos 90^(@)` = 0 ` "" (:. d bot F = mg)` Work done by the car against gravity `W Fd cos 90^(@) = 0 "" ( :. cos90^(@) = 0 )`