Answer:
So the answer is B. A is wrong because negative answer = deceleration
Answer: 40 N
Explanation: Use the formula
F = m a
to solve this.
F = (8 kg) (5 m/s²)
F = 40 kgm/s²
F = 40 N
The Kinetic Energy (KE) is calculated using the formula:
KE = 0.5 m v^2
Where,
m = mass of bare helium nucleus = 6.64 ✕ 10^−27 kg
v = velocity = 0.018 c = 0.018 * 3 ✕ 10^8 m / s^2 = 5.4 ✕ 10^6
m / s^2
Calculating:
KE = 0.5 (6.64 ✕ 10^−27
kg) (5.4 ✕ 10^6 m / s^2)^2
KE = 9.68✕<span> 10^−14
J</span>
Answer:
Final velocity of the elevator will be 4.453 m/sec
Explanation:
Let mass is m
Acceleration due to gravity is g m/sec^2
Distance s = 2.2 m
As the elevator is moving upward so net force on elevator
So according to question
0.46 mg = ma
a = 0.46 g
a = 0.46×9.8 = 4.508
Initial velocity of elevator is 0 m/sec
From third equation of motion
So final velocity of the elevator will be 4.453 m/sec