Constructive interference leads to
a. higher frequency
b. longer wavelengths
c. waves cancelling each other out
d. higher amplitude

John throws .4 kg ball with velocity of 18 m/s. hits .2 kg bottle and bottle flies 25 m/s. how fast is ball traveling after hitting the bottle?

Standing side by side ,you and a friend step off a bridge at different times and fall for 1.6s to the water below.your friend goes first,and you follow after he has dropped a distance of 2.0m.when your friend hits the water,is the seperation between the two of you 2.0m or more than 2.0m? verify your answer with a calculation.

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.