University physics 1: can you help find the answers for those two problems DQues

Question

University physics 1: can you help find the answers for those two problems DQuestion 15 2 pts A 4.7-kg ball is thrown from the top of a 5-m tall building (point A) with a speed of 1 m/s at an angle 6 degrees above the horizontal. If air resistance is negligible, what is the value of the kinetic energy of the ball as it hits the ground? DQuestion 16 2 pts The two masses in the figure are released from rest. What is the speed (in m/s) of the masses after the 3.0-kg mass has fallen 7.8 m? There is no friction on the 2.0 kg mass? 20kg 3.0kg

Explanation / Answer

15)

using conservation of energy

kinetic energy at the ground = kinetic energy at the top + Potential energy at the top

KE = (0.5) m v2 + mgh

KE = (0.5) (4.7) (1)2 + (4.7) (9.8) (5) = 232.65 J

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