Page 618 - SUBSEC October 2017_Neat

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Item 4 refers to the following diagram. Item 5 refers to the following diagram.

5. A wooden block of mass 0.80 kg is
4. A stone is thrown from a building at X, being pulled along a rough horizontal
and follows a parabolic path as shown surface with a force of 20 N as shown
in the diagram. The maximum height above. The block experiences an
-2
reached by the stone is P. The vertical acceleration of 5 ms . What is the
component of acceleration of the stone magnitude of the frictional force?
is
(A) 24 N
(B) 20 N
(A) maximum at P (C) 16 N
(B) maximum at X (D) 4 N
(C) the same at both X and P
(D) zero at P

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