When the life preserver is dropped from the helicopter, the only force acting on the object is the gravitational force. This modifies the equations of motion. Thus, the working equation is written below:
h = vt + 0.5gt²
where
v is the initial velocity
g is the acceleration due to gravity equal to 9.81 m/s²
h is the height of the fall
h = (1.46 m/s)(1.8 s) + 0.5(9.81 m/s²)(1.8 s)
h = 11.457 m
Answer:
The acceleration of the total mass decreases by half (1/2)
Explanation:
Given;
acceleration of sled = 2 m/s²
From Newton's second law of motion, F = ma
⇒m = F/a
F is the force applied by Jenny
This force applied by Jenny should be the same, after Tommy jumps on the sled, but the acceleration will change.
F = m₁a₁ = m₂a₂
Since m₂ = 2m₁, then we calculate a₂
m₁a₁ = 2m₁a₂
a₂ = a₁/2
Therefore,The acceleration of the total mass decreases by half.
Answer:
C Thy make the force exert all at once
Acceleration is the change in velocity
