Questions: ¿Cuál es la velocidad del libro después de caer? 0.90 s ? Supongamos que el sistema de coordenadas es positivo. Redondee la respuesta a dos digitos significativos.

Solution Steps

We are given the time \( t = 0.90 \) seconds. We need to find the velocity of the book after it has fallen for this duration. Assuming the book is in free fall, the only force acting on it is gravity.

The velocity of an object in free fall can be calculated using the equation: \[ v = g \cdot t \] where \( g \) is the acceleration due to gravity, approximately \( 9.81 \, \text{m/s}^2 \).

Substitute the known values into the equation: \[ v = 9.81 \, \text{m/s}^2 \times 0.90 \, \text{s} = 8.829 \, \text{m/s} \]

Round \( 8.829 \, \text{m/s} \) to two significant digits: \[ v \approx 8.8 \, \text{m/s} \]

Final Answer