The escape velocity from earth is 11.2 km per sec. If a body is to be projected in a direction making an angle 45° to the vertical, then the escape velocity is
11.2 × 2 km/sec
11.2 km/sec
11.2 ×$\dfrac{1}{\sqrt{2}}$ km/sec
11.2 ×${\sqrt{2}}$ km/sec