The 1N = 1kg * 1 m/s^2 has no influence on the answer.
F = 8 N
m = 1 kg
a = ??
F = m * a
8N = 1 kg * a
8N/1kg = a
a = 8 m/s^2
10
This is the beginning of a 2 step process. You are back to the basic 4 equations to find the acceleration. Then you can use F = ma
Givens
m = 1200 kg
vi = 2m/s
vf = 0
d = 15 cm = 0.15 m
Formula
F = m*a
vf^2 = vi^2 + 2 * a * d
0 = 2^2 + 2 * a * 0.15,
0 = 4 + 0.3 * a
- 4 = 0.3 * a
- 4 / 0.3 = a
- 13.3333333 = a
F = m * a
F = 1200 * (- 13.3333333)
F = - 16000 N
Comment (Extremely Important)
Why aren't any of the answers minus? It is because the minus represents the amount of force needed to stop the vehicle. But the question asks you about the rock. What is the rock experiencing? The rock is opposing the 0.15 m so the force it offers is in the opposite direction to that exerted by the vehicle.
When LeBron James jumps, he is driving force into the court. How is this force created? Suggested answer: This force is created by the energy stored inside his muscles.
The average velocity of Sandy is given by the total distance covered S divided by the total time taken t:
The total distance covered is while the total time taken is 2 hours + half an hour (for the rest) + 1 hour and half, so Therefore, the average velocity is
