In a simple machine the energy input is 120J if the efficiency of the machine is 80% calculate the energy output

State one advantage and one disadvantage of using a plane mirrior as a driving mirrior

Complete the statement about memory improvement. ( )involves organizing and breaking down information into easier groups to expand capacity. rehearsal is the verbal repetition of information. these techniques are especially important for the improvement of ( ) memory.

Aball of mass 0.3kg is released from rest at a height of 8m.how fast is it going when it hits the ground? accleration due to gravity is g=9.8m/s