a. A student tosses a coin into a large wishing well and wishes for good marks in physics. The coin is thrown from a height of 2.50 m above the water surface with a velocity of 4.00 m/s at an angle of 60.0° above the horizontal. As the coin strikes the water's surface, it immediately slows down to exactly half the speed it had when it struck the water and maintains that speed while in the water. After the coin enters the water, it moves in a straight line in the direction of the velocity it had when it struck the water. If the well is 2.90 m deep, how much time elapses between when the coin is thrown and when it strikes the bottom of the well? b. A projectile is fired in such a way that its horizontal range is equal to 8.5 times its maximum height. What is the angle of projection?

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Projectile Motion