Answer to Question #169744 in Physics for Lily

Question

Two students are discussing the motion of the dart-block system at the instant it reaches height H. The students make the following statements:

Student 1:​ ​The speed of the system at height H is zero. ​Since it is moving in circular motion and centripetal acceleration is given by ac = v2 ,​ the acceleration must also be zero.

Which underlined phrase or phrases, if either, are ​correct​ about student 1's statement? If neither phrase is ​correct,​ write "none."

Answer 1

 ​The speed of the system at height H is zero. ​This phrase is ​correct.