Question

28. A body is thrown vertically upward with certain
velocity. If its velocity became half after 2 sec, what
is the velocity with which it hits the ground?
a) 20ms-
b) 30ms -1
c) 40ms 1
d) 60ms-1
-1​

Answer 1

Answer:

v= u + at

let u (initial velocity) be x

and v (velocity after 2 sec ) = x/2

x/2 = x + 10 × 2

-x/2 = 20

x = -40 m/s

so answer will be +40m/s because initial velocity is equal to velocity by which it strikes the ground

answer :c) 40m/s