Lake Nettle is 180 kilometres wide. A yacht sailing east at a constant velocity took 2 hours to cross half the width of the lake. What was the yacht's velocity? Write your answer as a whole number.

Which of the following statements is true of enzymes? a)they dont provide an active site for substrates to bind in a reaction b)they act on a specific type of substrate in a reaction c)they unusable after a reaction d)they change shape after a reaction

Does the sun release radiant energy?

Acceleration is a direct result of a.) balanced forces b.) unbalanced forces c.) gravity d.) velocity