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Posted by on Sunday, October 16, 2011 at 9:49am.

Suppose a stone is thrown at an angle of 30 degrees below the horizontal, if it strikes the ground 57m away, find (a)the time of flight, (b)the initial speed, and (c) the speed and the angle of the velocity vector with respect to the horizontal impact.

  • physics - , Sunday, October 16, 2011 at 10:08am

    If it is thrown 30 degrees below horizontal, on level ground, it strikes the ground right away.

    Are you sure you copied the problem correctly?

  • physics - , Sunday, October 16, 2011 at 10:43am

    yes the question was copied correctly.

  • physics - , Sunday, October 16, 2011 at 12:20pm

    How high is the stone when thrown?

  • physics - , Sunday, October 16, 2011 at 1:24pm

    There was no height given and no other info given for this problem. Per the textbook, the answers are (a) 1.57sec (b) 41.9m/s (c) 51.3m/s and -45 degree angle. But I can't figure out how the answers were calculated?

  • physics - , Sunday, October 16, 2011 at 3:10pm

    Nor can I.

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