Question

To a person, going eastward in a car with a velocity of 25 km/hr, a train appears to move towards north with a velocity of $25\sqrt{3}$ km/hr. The actual velocity of the train will be

• A. 25 km/hr
• B. 50 km/hr
• C. 5 km/hr
• D. $5\sqrt{3}$ km/hr

Answer 1

Answer: (A)

25 km/hr

Answer 2

$v_{T} = \sqrt{v_{TC}^{2} + v_{C}^{2}}$=$\sqrt{(25{\sqrt{3)}}^{2} + (25)^{2}}$=$\sqrt{1875 + 625}$

=$\sqrt{2500}$ = 25 km/hr