The entangled velocity of the cars after the collision is 2.7 m/s.
<h3>What is velocity?</h3>
Velocity is the rate of change of displacement. The S.I unit of velocity is m/s.
To calculate the velocity of the entangled cars after the collision, we use the formula below.
Formula:
- mu+MU = V(m+M).............. Equation 1
Where:
- m = mass of the car
- M = mass of the truck
- u = initial velocity of the car
- U = initial velocity of the truck.
- V = velocity of the entangled car after the collision.
Make V the subject of the equation.
- V = (mu+MU)/(m+M)............ Equation 2
From the question,
Given:
- m = 2000 kg
- M = 18000 kg
- u = 0 m/s (at rest)
- U = 3 m/s
Substitute these values into equation 2
- V = [(2000×0)+(18000×3)]/(2000+18000)
- V = 54000/20000
- V = 2.7 m/s.
Hence, the entangled velocity of the cars after the collision is 2.7 m/s
Learn more about velocity here: brainly.com/question/13665920
Answer:
a) positive bc the surroundings are losing heat
b) positive
c) negative bc the surroundings are gaining heat
d) negative bc work is done by the system
Explanation:
the answer would be B. the back emf increases, and the current drawn from the socket increases
more current is needed to make the motor move, like when you try to self crank a motor and the back wires are touching its harder to crank. and the emf increases since more current is being drawn in, strengthening the emf or increasing the emf
Answer:
B
The plastic ball require lesser force than the iron ball