Answer:
For part 1) correct answer is : a) SB=SN<VB=VN
For part 2) correct answer is : a) SB=SN<VB=VN
Explanation:
We will use the following formula of momentum
momentum after collision
=momentum before collision
=m*u1-(3*m*u2)
As we know u1 = u2 = 20 m/s
Hence,
-2*m*20 = 4*m*v
v = -10 m/s
v being the common velocity of the SUV and car after the collision
As we know that impulse is J = change in momentum = m*(v-u)
And u being initial velocity which is same for the SUV and car
non belted passengers collide with dashboards with a force which is called as a internal force and due to that internal forces the momentum remains constant heance impulse is also same experienced by seatbelted and non seat belated
As mass of SUV is 3 times the mass or car.
Hence the correct option is a) SB=SN<VB=VN
2) There is the same order of rant for force and impulse
As we know that impulse j = F*dt
Hence correct answer. is a) SB=SN<VB=VN
Answer:
I believe 0
Explanation:
this is due to the fact that the box will not move anywhere the forces are canceling themselves out.
Answer:
I think the answer would be D.
Explanation:
It could be b or d, the reason that I think that it is d is because lifting does not directly involve your wrist.
Hope this helps!
<h2>The initial velocity is 2.3
</h2>
Explanation:
Suppose the speed of car at point A is u .
Its kinetic energy K = mu²
At point B , its kinetic energy = K
and its gravitational potential energy = K = m g h = 2 m g R
here height h = 2 R ( radius of circle )
From the principle of conservation of energy
m u² = m u² + 2 m g R
m u² = 2 m g R
Therefore u = = 2.3