10. Analyzing a common mistake. Question: The still water velocity of a rower is 5 m/s. At what angle must this rower point upstream to be able to land directly across the river? The current is moving at 3 m/s.
a. The most common incorrect answer for this type of question is 31° (from a line perpendicular to the shore).
Show a fully labelled vector diagram that illustrates how this answer was achieved. Circle the mistake and
briefly discuss the incorrect assumption that led to this solution.

The pressure proportional to the area a- inversely b- directly c- increase d-decrease

Aparticle's position is given by x = 3.00 - 9.00t + 3t2, in which x is in meters and t is in seconds. (a) what is its velocity at t = 1 s? (b) is it moving in the positive or negative direction of x just then? (c) what is its speed just then? (d) is the speed increasing or decreasing just then? (try answering the next two questions without further calculation.) (e) is there ever an instant when the velocity is zero? if so, give the time t; if not, answer "0". (f) is there a time after t = 3 s when the particle is moving in the negative direction of x? if so, give the time t; if not, answer "0".

An object dropped from cliff falls with a constant acceleration of 10 metre per second square find its speed of two seconds after it was dropped