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Answer: Option D
Under free-fall, where there is no air resistance, when you release the ball or throw a ball up, the moment the ball leaves your hand, the only force acting on the ball is its weight and the acceleration is a constant 10 m/s^2 and is downwards, towards the centre of the Earth.
Answer: Option A
Heat capacity (C) is the thermal energy transferred to increase the temperature of the substance by 1 oC or 1 K.
Specific heat capacity (c) is the thermal energy transferred to increase the temperature of 1 kg of substance by 1 oC or 1 K.
The relationship is C = mc
i.e. the mass of the beaker is not given as the heat capacity already has taken into account the mass.
Answer: Option B
This question can be solved using both Conservation of Energy and Kinematics. Indeed, using COE to solve will be much simpler and straight forward. But do know both methods.