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PtichkaEL [24]
3 years ago
14

Which statement(s) accurately describe the conditions immediately before and after the firecracker explodes:

Physics
1 answer:
lidiya [134]3 years ago
8 0

Answer:

Option C, The total momentum of the fragments is equal to the original momentum of the firecracker.

Explanation:

Kinetic energy of cracker cannot remain constant before and after explosion. It is so because in the process of burning and bursting some amount of kinetic energy is lost in the form of light and heat energy. While the total mass before and after the explosion remains constant due to which the momentum is conserved before and after the explosion

Hence, option C is correct

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from the edge of the rooftop of a building, a boy thros a stone at an angle of 25 above the horizontal. The stone hits the groun
ella [17]

Answer:38.675 m/s

Explanation:

\theta =25^{\circ}

t=4.2 s

R_x=105m

Solving in x direction

R_x=ut+\frac{1}{2}\left ( 0\right )t^2

105=ucos25\times 4.2

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Initial velocity in vertical direction usin25

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h=\left ( -usin25\right )4.2+\frac{1}{2} \left ( 9.8\right )\left ( 4.2\right )^2

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Therefore final vertical velocity is v_{vf}^2-\left ( usin25\right )^2=2\times 9.81\times 37.47

v_{vf}=29.51 m/s

Final Resultant velocity

V_{final}=\sqrt{29.51^2+24.99^2}

V_{final}=38.675 m/s

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