Question

Calculate the initial velocity of object of mass 100g which is brought to rest in 0.03 seconds by applying a retarding force of 100 N.​

Answer 1

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Answer 2

Answer:

u = 30 m/s

Explanation:

initial velocity , u = ?

final velocity , v = 0 m/s

mass of object , m = 100g = 0.1 kg

time to come in rest , t = 0.03 s

force , f = 100 N

acceleration , a = ?

therefore ,

f = ma

a = f/m = 100/0.1 = 1000 m/s^2

acceleration is in negative because the object is going to be stop ,

a = - 1000 m/s^2

therefore ,

v = u + at

-u = at -v

-u = -1000 * 0.03 - 0

u = 30 m/s