Work:
F: force
ds: displacement
Assuming the work is constant:
d displacement
Answer:
The force of impact, F = 17682.18 N
Explanation:
Given,
The initial velocity of the truck and associated velocity of RV, u = 2 m/s
The height of the cliff, h = 280 ft
= 85.344 m
The mass of the RV, m = 1800 Kg
The total energy of the RV at height, 'h' with velocity, 'v', E = P.E + K.E
P.E = mgh J
= 1800 x 9.8 x 85.344
= 1505468.16 J
K.E = mv²/2
= 1800 x 2² / 2
=3600 J
Therefore total energy, E = 1509068.16 J
This is equal to the kinetic energy of RV at the impact.
The force of impact,
F = E/h
= 1509068.16 J / 85.344 m
= 17682.18 N
Hence, the force of impact of RV is, F = 17682.18 N
25x = 200*30
25x= 6000
x= 240
Answer: Dr. William Herbert Sheldon
The Sheldon Coin Grading Scale is an internationally accepted, 70-point assessment of a coin's condition and quality. It was originally developed by Dr. William Herbert Sheldon in 1949 in order to grade large cents. His scale was slightly modified in the 1970s to account for a wider range of coins.
