Question

It is about work, energy.​

Answer 1

a) 1m

b) (i) 1.11m (ii) energy is transformed into heat, noise, vibration etc.

c) no

Step-by-step explanation:

a) conservation of energy

b) mgh * 0.9 = mg*1m => h= 1m/0.9

c) Mandy would add kinetic energy to the ball.