a) increases
b) decreases
c) first increases and then decreases after reaching a maximum value at optimum speed
d) first decreases and then increases after reaching a minimum value at optimum speed
Ans: c
a) increases
b) decreases
c) first increases and then decreases after reaching a maximum value at optimum speed
d) first decreases and then increases after reaching a minimum value at optimum speed
Ans: c