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Please helps 2. A robin of mass 150 g uses 10 J of energy and speeds up to 15 m/s in level flight. Calculate the

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2. A robin of mass 150 g uses 10 J of energy and speeds up to 15 m/s in level flight. Calculate the initial speed of the robin. [3 marks] 3. An 87-g box is attached to a spring with a force constant of 82 N/m. The spring is compressed 11 cm and the system is released. What is the speed of the box when the spring is released? [3 marks]

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