The si unit for temperature is Kelvin(k)
Explanation:
Draw a free body diagram. There are two forces: weight force pulling down and air resistance pushing up.
Sum the forces in the y direction:
∑F = 50 N − (30 kg) (10 m/s²)
∑F = -250 N
Since the rock as been dropped off the building you can assume that initial velocity equals 0m/s.
t=4.5s
acceleration due to gravity=9.8m/s^2
s=ut+1/2at^2
Since u=0, s=1/2at^2
s=1/2(9.8)(4.5)^
s=99.225m
