Question

A particle initially moving with a velocity of $10{\text{ms}}^{-1}$ starts decelerating at a constant rate of $5{\text{ms}}^{-2}$. The time at which the particle becomes stationary is

• A. $2\text{s}$
• B. $0.5\text{s}$
• C. $1\text{s}$
• D. $2.5\text{s}$

Answer 1

The correct option is A $2\text{s}$

Answer (2)
$u=10{\text{ms}}^{-1}$,
$a=-5{\text{ms}}^{-2}$,
v$=u+at$
$0=10-5t$
$\Rightarrow t=2\text{s}$