Physics
A brick of mass 1.0 kg slides down an ice roof inclined at 30 degrees with respect to the horizantal. If the brick starts from rest, how fast is it moving when it reaches the edge of the roof 0.90s later? Ignore friction
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The acceleration of gravity is 9.8 m/s2. Using the kinematic equations for uniform acceleration, we can solve for the final velocity of the brick after 0.90 seconds. Since the brick is initially at rest, the initial velocity is 0 m/s. The acceleration due to gravity is 9.8 m/s2 and the time is 0.90s, so we can calculate the final velocity: v = at = (9.8 m/s2) x (0.90 s) = 8.82 m/s The brick is moving at 8.82 m/s when it reaches the edge of the roof 0.90s later.
