Question

A body with an initial velocity 10 km/hour comes to rest after 15 minutes. Then the distance covered by the
body is -
(A) 2.5 km
(B) 1.25 km
(C) 5 km
(D) 10 km​

Answer 1

Step-by-step explanation:

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Answer 2

The distance covered by the body is 1.25km. So the correct option is (B).

Step-by-step explanation:

the initial velocity of the body(u)=10km/hr

final velocity(v)=0 as the body comes to rest

time is taken by the body=15 mins=0.25 hr

first, we have to find the acceleration by using the formula

$v=u+at$

⇒$0=10+0.25a$

⇒$0.25a=-10$

⇒a=$\frac{-10}{0.25}$

⇒$a=40km/hr^{2}$

now to find the distance(s) covered we will use the formula,

$v^{2} -u^{2} =2as$

⇒$10^{2} -0^{2} =2.40.s$

⇒$80s=100$

⇒$s=\frac{100}{80}$

⇒$s=1.25km$