Question

A car falls of a ledge and drops to the ground in $0.5s(g=10m/s^2)$
(a)Find the speed on striking the ground.
(b)How high is the ledge from the ground.
(c)If car is of mass 100 kg ,what will be the force by which car will hit the ground.

Answer 1

Time taken$=0.5s$

(a) $v=u+at=0+10\times 0.5=5m/s$

(b) $v^2-u^2=2as$

$=25-0=2\times 10\times h$

$h=\frac{25}{20}=1.25m$

(c) $m=100kg$

$F=ma$

$100\times 10=100N$