Part A What does a 126N rock weigh if it is accelerating upward at 20.0m/s2 ? Pa
ID: 1392901 • Letter: P
Question
Part A
What does a 126N rock weigh if it is accelerating upward at 20.0m/s2 ?
Part B
What does a 126N rock weigh if it is accelerating downward at 3.00m/s2 ?
Part C
What would be the answers to parts (A) and (B) if the rock had a mass of 126kg ?
Answer in the order indicated. Separate your answers with a comma.
Part D
What would be the answers to parts (A) and (B) if the rock were moving with a constant upward velocity of 23.0m/s ?
Answer in the order indicated. Separate your answers with a comma.
Explanation / Answer
A)
as m = W/g
m = 126/9.8
m = 12.9 Kg
Now, W = m *(g + a)
W = 12.9 *(9.8 + 20)
W = 383.14 N
B)
Now,
W = m*(g - a)
W = 12.9 *(9.8 - 3)
W = 87.72 N
C)
for m = 126 Kg
answer to A is
W(A) = 126 *(9.8 + 20)
W(A) = 3755 N
for answer to B
W(B) = 126 *(9.8 - 3)
W(B) = 856.8 N
D)
for moving with constant speed ,
answer to A and B is
W(A) = W(B) = 126 N