Answer:
T = 4000 N
Explanation:
We have,
Mass of an elevator, m = 500 kg
It is moving downward with an acceleration of . It is required to find the tension force of the cable on the elevator. We know that when the elevator is moving downward, the net force on it is given by :
g is acceleration due to gravity
So, the tension force of the cable on the elevator is 4000 N.
Answer:
D
Explanation:
plz plz this answer is good i hope
Answer:
The final speed at the gree light is 5.714 m/s
Explanation:
Given that,
Initial speed of the motorist (U) = 20m/s
Displacement of the traffic light (S) = 200m
time taken to slam the brake (t₁) = 1s
Now, the displacement of the motorist, till she slams the brake
S₁ = U × t₁
= 20 × 1
= 20m
The remaining distance would be
S₂ = S - S₁
S₂ = 200 - 20
S₂ = 180m
Now, the deceleration of the motorist
S₂ = Ut + 1/2at²
180 = (20 × 14) + 0.5a(14)²
a = - 1.02m/s²
The final speed would be
v = u + at
v = 20 + (- 1.02)(14)
v = 5.714 m/s
The final speed at the gree light is 5.714 m/s