Question

A force of 25 n acts on a body at rest for 0.2s and a force of 70 n acts for the next 0.1 s in the opposite direction if the final velocity is 5 m/s find the mass of the body

Answer 1

Answer:

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m = 0.4 kg

Explanation:

Let the mass of the body be m

F = m * a

25 = m (v-0/0.2)

25 = m (v/20

5 = mv

v = 5/m

Initial velocity for next

-70 = m (-5-5/m)/0.1

-7 = m (-5-5/m)

-7 = -5-5/m

-2 = -5m

m = 0.4 kg

Hence the mass of the body is 0.4 kg