Answer:
the final speed of the barrier would be 40m/s
Explanation:
Hello, I think I can help you with this.
the momentum is given by:
P=m*v, where P is the momentum, m is the mass of the object and v is the speed of the object.
if the momentum is transferred completely it means that the barrier will have the same amount of momentum, in other terms
momentum of the moped=momentum of the barrier
mass of the moped*speed of the moped=*speed of the barrier
let's isolate the final speed of the barrier
final speed of the barrier is
so, the speed is 40 m/s
Answer:
72 joules
Explanation:
The potential energy of that hammer is a function of its displacement against gravity. Considering that it fell with a velocity of 12 m/s, it was its displacement against gravity that gave it this velocity. It will continue to move until its displacement to gravity is zero.
since the body is in motion; it has converted its potential energy (mgh, m is mass, g is acceleration due to gravity, and h is the height) to kinetic energy (energy due to motion, 1/2mv^2; m = mass, v = velocity or speed)
therefore the potential energy is equal to kinetic energy
mgh = 1/2mv^2 = 1/2 *1kg* 12*12 = 72 joules.
A. The average force exerted on the ball during the serve is 57 N
B. The resistive force, given the data is -1125 N
<h3>A. How to determine the average force</h3>
- Mass (m) = 57 g = 57 / 1000 = 0.057 Kg
- Initial velocity (u) = 50 m/s
- Time (t) = 0.05 s
- Acceleration (a) = u / t = 50 / 0.05 = 1000 m/s²
- Force (F) = ?
F = ma
F = 0.057 × 1000
F = 57 N
<h3>B. How to determine the resistive force</h3>
- Mass (m) = 3000 Kg
- Initial velocity (u) = 72 Km/h = 72 / 3.6 = 20 m/s
- Final velocity (v) = 18 Km/h = 18 / 3.6 = 5 m/s
- Time (t) = 40 s
- Force (F) = ?
F = m(v – u) / t
F = 3000(5 – 20) / 40
F = -1125 N
Learn more about momentum:
brainly.com/question/250648
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