Question

A buffalo of mass 300kg is moving from rest. After 15sec its speed changed to 36km/hr. Find the force , acceleration and momentum.

Answer 1

Mass of buffalo = 300 kg

initial velocity,u = 0 m/s { as in rest }

After time , t = 15 s

final velocity, v = 36 km/h = 36×5/18 m/s

or, v = 10 m/s

Let a be the acceleration .

As we know ;

v = u + a t

so, 10 = 0 + a × 15

so, a = 10/15 = 2/3 m/s^2

# Hence acceleration = 2/3 m/s^2 #
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As Force = m a

# so, Force = 300 × 2/3 = 200 N #
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As momentum = m v

# so, initial momentum = 300×0 = 0 kg m/s
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so, final momentum = 300×10 = 3000 kg m/s #
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