F-40Nm=5kk = 0,2a=?
1 answer:
You might be interested in
Answer:
Constant speed: yes
Constant velocity: no
Explanation:
Let's remind the definition of speed and velocity:
- Speed is a scalar quantity, which is equal to the ratio between the distance covered (regardless of the direction) and the time taken:
- Velocity is a vector quantity, so it has both a magnitude and a direction. The magnitude is equal to the rate between the displacement of the object and the time taken, while the direction is the same as the displacement.
In this problem, we notice that:
- The speed of the car remains constant, as it is 90 km/h
- However, its direction of motion changes while the car travels round the corner: this means that the direction of the velocity is also changing, therefore velocity is not constant.
Answer:
Explanation:
Given:
- mass of John,
- mass of William,
- length of slide,
(A)
height between John and William,
<u>Using the equation of motion:</u>
where:
v_J = final velocity of John at the end of the slide
u_J = initial velocity of John at the top of the slide = 0
Now putting respective :
<u>Now using the law of conservation of momentum at the bottom of the slide:</u>
<em>Sum of initial momentum of kids before & after collision must be equal.</em>
where: v = velocity with which they move together after collision
is the velocity with which they leave the slide.
(B)
- frictional force due to mud,
<u>Now we find the force along the slide due to the body weight:</u>
<em><u>Hence the net force along the slide:</u></em>
<em>Now the acceleration of John:</em>
<u>Now the new velocity:</u>
Hence the new velocity is slower by
