to find the height of a bridge over a river. a stone is dropped freely in the river from the bridge.the stone takes 2s to touch the water surface of the river. calculate the height of the bridge from the water surface (g=9.8 m/s
h = 0.5g*t^2
To find the height of the bridge from the water surface, we can use the formula for free fall motion:
h = (1/2) * g * t^2
where:
h is the height of the bridge
g is the acceleration due to gravity (given as 9.8 m/s^2)
t is the time taken for the stone to touch the water (given as 2 seconds)
Substituting the values into the formula, we have:
h = (1/2) * 9.8 * 2^2
h = 4.9 * 4
h = 19.6 meters
Therefore, the height of the bridge from the water surface is 19.6 meters.