Question

A force $F$ acts horizontally on a block of mass $m$ that is initially at rest on a smooth horizontal floor. The force acts for a time $t$ and moves the block a displacement $d$.
Find out the change in momentum of the block ?

• A. $\frac{F}{t}$
• B. $\frac{m}{t}$
• C. $Fd$
• D. $Ft$
• E. $mt$

Answer 1

Answer: (D)

$Ft$

Net force acting on the block = $F$

Time for which the force acts =$t$

Using momentum-force relation, we get $\Delta P=F\times t$