During the volcanic eruption chunks of solid rock are blast…

Physics Motion in a Plane General MCQ (Single Correct)

During the volcanic eruption chunks of solid rock are blasted out of the volcano.

At what initial speed would a volcanic object have to be ejected at 37º to the horizontal from the vent A in order to fall at B as shown in figure.

What is the time of flight. (g = 9.8 m/s2)

Text Solution

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The correct answer is:

CHECK THE SOLUTION.

Taking the point A as origin, with upward direction of motion postive and using the equation,

for horizontal motion: (i)
and for vertical motion: (ii)
Substituting r from Eqn. (i) in (ii),

Неге and
So,

or
Substituting the above value of u in Eqn. (i).

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