Solve please.

Worksheet - 5.3 Conservation of Energy A 1.1 kg coconut falls out of a tree and strikes a bystander 1.7 m tall at 14 m/s. Using conservation of energy, determine the height of the coconut tree. 2. A 45.9 g golf ball leaves the tee at 32 my/s and rises to a height of 22 m during its flight. Determine the speed of the ball at this height assuming no energy loses to air resistance. 3. A 4.0 x 10' kg roller coaster starts from rest at A. (a] Neglecting friction, calculate the speed at B. (b) If 20% of the energy is lost to friction before arriving at C, determine the speed at point C