Question

A constant retarding force of 50 N is applied to a body of mass 20 kg moving initially with a speed of 15 ms-3. How long does the body take to stop?​

Answer 1

Answer:

constant retarding force of 50 N is applied to a body of mass 20 kg moving initially with a speed of 15 ms-3. How long does the body take to stop?

Answer 2

ock 35 lakh questions

What's your doubt?

11th

>Physics

>Motion in a Straight Line

>Stopping Distance and Reaction Time

>A. A constant retarding for...

Physics

Bookmark

A. A constant retarding force of 50 N applied to a body of mass 20 Kg moving initially with a speed of 15 m s

−1

. How long does the body take to stop?

B. A constant force acting on a body of mass 3.0 Kg change its speed from 2.0 m s

−1

to 3.5 m s

−1

in 25 s. The direction of the motion of the body remain same, the magnitude of the force will be

Medium

share

Share

Answer

A. Given that,

Force F=50N

Mass m=20kg

Initial velocity u=15m/s

Now, from newton’s second law

F=ma

50=20×a

a=2.5m/s

2

Now from equation of motion

v=u+at

0=15+(−2.5)t

t=

2.5

15

t=6s

Hence, the body will be stop in 6 sec.