Question

A body of mass 1000kg travelling at a speed of 36km/h is brought to rest in 50s .The average retarding force on the body will be​

Answer 1

Given :

• Mass of body = 1000 kg

• Initial velocity = 36 km/hr = 10 m/s

• Final velocity = 0 km/hr

• Time = 50 s

To Find :

• Average retarding force on the body

Solution :

First we have to find acceleration of body

★ v = u + at

→ 0 = 10 + 50a

→ a = - 10/50

→ a = - 1/5 m/s²

Now retarding force

★ F = ma

→ F = 1000 × ( - 1/5 )

→ F = - 200 N

Note :- Negative sign of acceleration and force denotes that they are in opposite direction of motion.

Answer 2

Answer:

F=ma

-200 N

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