Question

9. 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)
(a) 10 m/s
(b) 20 m/s
(c) 14 m/s
(d) none of these​

Answer 1

Answer: The answer is (c)

Explanation: Height (s) = 10m

After reching the maximum point it will stop and didnt move at all , sothe final velocity will be (v) = 0 and , Let initial be = u

So acceleration due to gravity is 9.8 m/s'2

USING 3 EQUATION OF MOTION

V'2 = U'2 +2AS

0'2 = U'2 +2× 9.8 × 10

u'2 = 196

u = 14m/s Answer As the coming to that poont it will attain the same velocity it was having earlier...............