An anisotropic material:.a. is a material in which properties vary depending on which crystallographic direction the measurements are taken. b. is the area of atomic mismatch which exists between crystalline regions in the materials with different orientation or atomic arrangement. c. lacks systematic and regular arrangement of atoms over relatively large atomic distances. d. is composed of a collection of many small crystals.

Aballoon is rising vertically upwards at a velocity of 10m/s. when it is at a height of 45m from the ground, a parachute bails out from it. after 3s he opens his parachute and decelerates ata a constant rate 5m/s.when. (a) what was the height of the parachutist above the ground when he opened his parachute? (b)how far is the parachutist from the balloon at t=3s? (c)with what velocity does the parachutist hit the ground? (d)after how long does the parachutist hit the ground after his exist from the balloon?