Question

A body is thrown vertically upwards and rises to a height of 10 m. The velocity with which the body was thrown upwards is (g = 9.8 $m/s^2$)

• A. 10 m/s
• B. 20 m/s
• C. 14 m/s
• D. none of these

Answer 1

Answer: (C)

14 m/s

${v_{final}}^2={u_{initial}}^2+2aS⟹0=u^2-2gH⟹u=\sqrt{2gH}$

$⟹u=\sqrt{2\times 9.8\times 10}⟹u=14m/sec$