In an experiment, a spring balance is
used to pull a cart across three different
surfaces: X, Y and Z. The spring balance
readings are recorded as given below.
Which one of the following options
correctly identifies surfaces X, Y and
Z based on the force required to pull
the cart?
A Surface X is grass, surface Y is
concrete, surface Z is a polished floor.
B Surface X is a polished floor, surface
Y is grass, surface Z is concrete.
C Surface X is concrete, surface Y is a
polished floor, surface Z is grass.
D Surface X is polished floor, surface Y
is concrete, surface Z is grass.
It is d