Question

1.
A robot shoots a ball in upward direction with an initial velocity of 30m/s then height covered wil
be
after 2s.
(a) 30m
b. 40m
C. 50m
d. None of them​

Answer 1

Explanation:

Initial velocity = 30 m/s

Final velocity = 0 m/s

Acceleration of the ball = g = 10m/s²

Applying equations of motion,

v² - u² = 2gh

=>0² - 30² = 2×-g×h

( (-)sign indicates acceleration has opposite direction w.r.t. velocity).

=> 900 m²/s² = 2 × 10 m/s² × h

=> h = 900/20 = 45 m

Hence,

d is the correct option.