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2 years ago

7

Please help if you can

1 answer:

denis23 [38]2 years ago

6 0

Answer:

The answer is B

Explanation:

Because when the both sides aren't balanced one side has to cause motion. (fall down)

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A stone is thrown upward from the top of a building at an angle of 30° to the horizontal and with an initial speed of 20 m/s. Th

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Explanation:

Given

inclination $\theta =30^{\circ}$

initial speed $u=20\ m/s$

Point of release is 45 m above the ground

Considering stone to be a projectile, so time taken by projectile for its zero vertical displacement is

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Now after completing zero vertical displacement , stone needs to travel another 45 m in downward direction with initial speed u=20\sin 30

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$t_0^2=\frac{70}{9.8}$

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thus total time time required is $t=t_0+t_1=2.64+2=4.64\ s$

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$v_y=\sqrt{u_y^2+2\times a_y\times s}$

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$v_y=\sqrt{1000}=31.622\ m/s$

Horizontal velocity $v_x=u\cos 30=17.32\ m/s$

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$=\sqrt{1299.82}=36.05\ m/s$

7 0

3 years ago