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Lakhmir Singh Solutions Class 9 Physics Solutions for Exercise in Chapter 1 - Motion

Question 87 Exercise

a) Explain the meaning of the following equation of motion: v = u + at where the symbols have their usual meanings.

b) A body starting from rest travels with uniform acceleration. If it travels 100 m in 5 s what is the value of acceleration?

Answer:

a) v = u + at is the first equation of motion.

Where,

v is the final velocity

u is the initial velocity

a is the acceleration

t is the time taken

b) Initial velocity, u = 0 m/s

Time, t = 5s

Distance, s = 100 m

Acceleration, a = ?

\mathrm{s=ut+\frac1 2 at^2}

a = 200/25 = 8 \mathrm{m/s^2}

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