Question

At some planet gravitational acceleration is $1.96m/se{c}^{-2}$. If is safe to jump from a height of 2 m on earth, then what should be the corresponding safe height for jumping on the planet:

• A. 5 m
• B. 2 m
• C. 10 m
• D. 20 m

Answer 1

Answer: (C)

10 m

G on earth=9.8

ratio between earth and planet$=9.8:1.96$

= 5

so the safe height on the planet is 5 time greater than earth because

gravitational pull of that planet is 5 time less than earth

so required height = height on earth $\times$ 5

$2\times 5$m

=10 m is the safe height on that planet.

Hence,

option $C$ is correct answer.