Question

A ball falls off a table and reaches the ground in 1s. Assuming g=9.8m/s², calculate its speed on reaching the ground and the height of the table.

a) Speed: 4.9 m/s, Height: 4.9 m
b) Speed: 9.8 m/s, Height: 4.9 m
c) Speed: 4.9 m/s, Height: 9.8 m
d) Speed: 9.8 m/s, Height: 9.8 m

Answer 1

The speed of the ball when it reaches the ground is 9.8m/s and the height of the table is 4.9m.

Step-by-step explanation:

To calculate the speed of the ball when it reaches the ground, we can use the formula:

Speed = Acceleration * Time

Given that the acceleration due to gravity (g) is 9.8m/s² and the time (t) is 1s, we can plug in these values to calculate the speed:

Speed = 9.8m/s² * 1s = 9.8m/s

The speed of the ball when it reaches the ground is 9.8m/s.

Next, we can calculate the height of the table using the formula:

Height = 0.5 * Acceleration * Time²

Plugging in the values of acceleration (9.8m/s²) and time (1s), we get:

Height = 0.5 * 9.8m/s² * 1s² = 4.9m

The height of the table is 4.9m.