Question

A car falls off an edge and drops to the ground in 0.5 seconds. What is its speed on striking the ground? (Take g = 10 $m{s}^{-2}$)

• A. 5 $m{s}^{-1}$
• B. 1 $m{s}^{-1}$
• C. 3 $m{s}^{-1}$
• D. 4 $m{s}^{-1}$

Answer 1

The correct option is A

5 $m{s}^{-1}$

Given, time taken(t) = 0.5 second, accleration due to gravity(g) = 10 $m{s}^{-1}$, initial speed (u) = 0 ( As car is under free fall ) and final velocity on striking the ground = $v$

Using equation of motion, $v=u+gt$

$v=0+10\times 0.5$

$v$= 5 $m{s}^{-1}$