![](../../image/prcpywrt.gif)
When air resistance can be neglected, an object which falls from rest
for three seconds will fall a distance of
(A) 15m.
(B) 30m.
(C) 45m.
(D) 90m.
![](../../image/prcpywrt.gif)
When air resistance can be neglected, an object which falls from rest
for three seconds will fall a distance of
(A) 15m. --- No.
The distance depends on t![](../../image/2.gif)
-- t multiplied by itself.
![](../../image/prcpywrt.gif)
When air resistance can be neglected, an object which falls from rest
for three seconds will fall a distance of
(B) 30m. --- No.
Use d = (1/2)at
.
![](../../image/prcpywrt.gif)
When air resistance can be neglected, an object which falls from rest
for three seconds will fall a distance of
(C) 45m. --- Yes.
d = (1/2)(10m/s
)(3s)
= (1/2)(10)(3)(3)m.
![](../../image/prcpywrt.gif)
When air resistance can be neglected, an object which falls from rest
for three seconds will fall a distance of
(D) 90m. --- No.
No. Don't forget the (1/2) in the formula.