Question

1. a car of mass 1000 kg is moving with a velocity of 10 m/s under the action of a forward force of 1000 n and retarding force of 500 n due to friction. what will be its velocity after 5 seconds​

Answer 1

Answer:

Velocity of the car after 5 second is $12.5m/s^2$

Explanation:

Mass of the car is, m=1000 kg

Initial velocity under which car is moving is, $u=10m/s$

Forward force with which car is moving is ,$F=1000N$

The retarding force due to friction is , $f=500N$

Net force acting the mass is $F-f = 1000-500= 500N$ (minus because friction is opposite to forward force). Net force = mass* acceleration

⇒ $ma=500N$⇒$a=\frac{500}{1000}=0.5 m/s^2$final velocity after 5 seconds can be found from, $a =\frac{v-u}{t}$

⇒$v = u+at\\=10+0.5*5\\=12.5 m/s^2$.