A MAN IS STANDING ON TOP OF A B UILDING 25M TALL THROWING A BALL WITH SPEED 5M/S

Question

A MAN IS STANDING ON TOP OF A B UILDING 25M TALL THROWING A BALL WITH SPEED 5M/S AT THE FOLLOWING ANGLES 0 45 80 90.

1. DOES INCREASING THE ANGLE AT WHICH THE BALL IS INITIALLY THRON AMKE THE MAGNITUDE OF THE FINAL VELOCITY OF THE BALL LESS THAN, EQUAL TO, OR GREATER THAN THE MAGNITUDE OF THE FINAL VEDLOCITY OF A BALL THROWN AT A LOWER ANGLE?

2.DOES INCREASING THE ANGLE AT WHICH THE BALL IS INITIALLY THROWN MAKE THE MAGNITUDE OF THE FINAL MECHANICAL ENERGY OF THE BALL LESS THAN, EQUAL TO, OR GREATER THAN THE MAGNITUDE OF THE FINAL MECHANICAL ENERGY OF A BALL THROWN AT A LOWER ANGLE?

3.DOES INCREASING THE ANGLE AT WHICH THE BALL IS INITIALLY THROWN MAKE THE TOTAL TIME THE BALL SPENDS IN THE AIR BALL LESS THAN, EQUAL TO, OR GREATER THAN THE MAGNITUDE OF THE TOTAL TIME SPENT IN THE AIR OF AOF A BALL THROWN AT A LOWER ANGLE?

Explanation / Answer

here,

as the height of launch is same for these angles and initial velocity is also same

using the conservation of energy

the final mechanical energy is same as the initial mechanical energy

1.

the magnitude of the final velocity of balls are equal

2.

the final mechanical energy is same for all angles

3.

as these angles are above the horizontal

increasing the angle will increase the magnitude of time than the ball at lower angle

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