A box is put on a scale which is adjusted to read zero, when the box is empty. A stream of pebbles is then poured into the base from a height h above its bottom at a rate of n pebbles/s. Each pebble has a mass m. If the pebbles collide with the box such that they immediately come to rest after collision, then the scale reading at time t after the pebbles begin to fill the box is -
A
mnt
B
mn [ 
+ gt]
+ gt]
C
mngt
D
Zero
Text Solution
Verified by ExpertsThe correct answer is:
B
Scale reading = v 
+ (mnt) g
= 
mn + mng t
= mn ( 
+ gt)
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