Answer:
relay switch
Explanation:
relay switch is the answer
Fall time machine:
t = √ (2*H/g) = √ (2*40.8 / 9,8) ≈ 2.9 s
Horizontal movement:
S = V₀*t
Speed:
V₀ = S / t = 121 / 2.9 ≈ 41.7 m/s or 150 km/h
Answer:0.017
Explanation:
Given
mass of person 
mass of sled 
velocity of person 
let u be the combined velocity of person and sled
conserving momentum




(b)Total distance traveled by sled and man is 30 m
deceleration Provided by surface is 
where
is coefficient of kinetic friction
using 


Power
is calculated by dividing the work done with the time interval of the motion.
Work, on the other hand, is force times the distance traveled. Therefore, we
can calculate as follows:<span>
Power=W/t = mgd/t
90 = 60(9.81)d / 40
d = 6.12 m
Number of steps = 20/6.12 = 3.27 or 3 steps</span>