Please answer this all question thank you. Thinking and Inquiry A man applies a 2 kJ of mechanical energy to pull a rope

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Please answer this all question thank you.
Thinking and Inquiry
A man applies a 2 kJ of mechanical energy to pull a rope
and lift a 25 kg block at constant speed to a height of 10 m using
a pulley. Calculate the efficiency of the system.
A 0.60 kg piece of ice at -10oC is placed in 0.30 kg of
water at 50oC. How much water is there when the system reaches
thermal equilibrium?
An 85-kg jogger is running at a speed of 6.5 m/s. a)
what is the kinetic energy of the jogger? b) What is the work done
by the force that accelerates the jogger to 6.5 m/s from
rest?