141797 When a ball is dropped into a lake from a height \(4.9 \mathrm{~m}\) above the water level, it hits the water with a velocity \(v\) and then sinks to the bottom with the constant velocity \(v\). It reaches the bottom of the lake \(4.0 \mathrm{~s}\) after it is dropped. The approximate depth of the lake is :
141797 When a ball is dropped into a lake from a height \(4.9 \mathrm{~m}\) above the water level, it hits the water with a velocity \(v\) and then sinks to the bottom with the constant velocity \(v\). It reaches the bottom of the lake \(4.0 \mathrm{~s}\) after it is dropped. The approximate depth of the lake is :
141797 When a ball is dropped into a lake from a height \(4.9 \mathrm{~m}\) above the water level, it hits the water with a velocity \(v\) and then sinks to the bottom with the constant velocity \(v\). It reaches the bottom of the lake \(4.0 \mathrm{~s}\) after it is dropped. The approximate depth of the lake is :
141797 When a ball is dropped into a lake from a height \(4.9 \mathrm{~m}\) above the water level, it hits the water with a velocity \(v\) and then sinks to the bottom with the constant velocity \(v\). It reaches the bottom of the lake \(4.0 \mathrm{~s}\) after it is dropped. The approximate depth of the lake is :