Question

A ball is thrown vertically upwards with a velocity of 49 m/s. Calculate. the total time it takes to return to the surface of the earth.

Answer 1

Hey!!!!

$given$

$g = - 10m \ {s}^{2}$
$u = 49 \frac{m}{s}$
$v = 0 \frac{m}{s}$
Therefore,

by 1st equation of motion

v=u+gt

0= 49+(–10)t

–49= –10t

–49/–10=t

4.9 sec = t


Therefore, the required time is 4.9 sec.




#BE BRAINLY

Answer 2

Hi , there !!!

here is your answer :-

we consider g = 9.8



total time taken to return to the surface of earth is given by formula = 2u / g




so on putting value we get


=> 2 × 49 / 9.8




so , total time taken to return to earth surface is = 10 s .



hope it helps you!!!

thanks !!!

Ranjan kumar .