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A pendulum is pulled until its angle is 25° to the vertical

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A pendulum is pulled until its angle is 25° to the vertical. Assume the string is massless.A. Determine the height of the ball at the top of its swing.B. What is its velocity at the bottom of its swing?(On level Physics: give what you can, concept or equation-wise.)C. Let's assume the pendulum is moving 4 m/s just before it hits the resting box.(This is NOT the actual speed from part A, but a reset if you made a mistake.)If the pendulum bounces back from the box going 0.7 m/s, what is the speedof the box after the collision?D. Decide what kind of collision it was.