Answer:
option A is correct
Explanation:
acceleration the time rate of change of velocity or speed so
a=Δv/t
Δv=vf-vi
Δv= final speed-initial speed
now a=final speed-initial speed/time
The sound produced is called wheezing. It is somewhat like a whistle except it's more course and you don't do it voluntarily like whistling, but rather it occurs because of obstructions. It can be either vocally or you can hear it when there are nasal obstructions when you are breathing through your nose.
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- m1=1500kg
- m_2=3000kg
- v_1=5m/s
- v_2=7m/s
Using law of conservation of momentum
![\\ \sf\Rrightarrow m_1v_1-m_2v_2=(m1+m2)v_3](https://tex.z-dn.net/?f=%5C%5C%20%5Csf%5CRrightarrow%20m_1v_1-m_2v_2%3D%28m1%2Bm2%29v_3)
![\\ \sf\Rrightarrow 1500(5)-3000(7)=(1500+3000)v_3](https://tex.z-dn.net/?f=%5C%5C%20%5Csf%5CRrightarrow%201500%285%29-3000%287%29%3D%281500%2B3000%29v_3)
![\\ \sf\Rrightarrow 7500-21000=4500v_3](https://tex.z-dn.net/?f=%5C%5C%20%5Csf%5CRrightarrow%207500-21000%3D4500v_3)
![\\ \sf\Rrightarrow -13500=4500v_3](https://tex.z-dn.net/?f=%5C%5C%20%5Csf%5CRrightarrow%20-13500%3D4500v_3)
![\\ \sf\Rrightarrow v_3=-3m/s](https://tex.z-dn.net/?f=%5C%5C%20%5Csf%5CRrightarrow%20v_3%3D-3m%2Fs)
Answer:
B) Force of gravity
Explanation:
As it is the force which acts downward on the body towards the ground, it is clearly the force gravity represented by the arrow at A.
Gravitational potential energy = mass x gravitational field strength (g) x height