The escape velocity from earth is 11.2 km/s. If a body is to be projected in a direction making an angle 45° to the vertical, then the escape velocity is (a) 11.2 × 2 km/s (b) 11.2 km/s (c) 11.2/√(2) km/s (d) 11.2√(2) km/s

Answer: (b). Escape needs only enough KE: 1/2mv² = GMm/R, which has no direction in it. So escape velocity is independent of the angle of projection. So the answer is (b) 11.2 km/s.

The escape velocity from earth is 11.2 km/s. If a body is to be… | NEET 1993 (AIPMT)

Q84NEET 1993 · AIPMTEasy

Escape Velocity

The escape velocity from earth is $11.2\text{ km/s}$ . If a body is to be projected in a direction making an angle $45^\circ$ to the vertical, then the escape velocity is

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Answer: (b)

Escape needs only enough KE: $\frac{1}{2}mv^2 = \frac{GMm}{R}$ , which has no direction in it.
So escape velocity is independent of the angle of projection.
So the answer is (b) 11.2 km/s.

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