In projectile motion the modulus of rate of change of speed | Physics | SolveeIt

Question

In projectile motion the modulus of rate of change of speed

is constant

First increases then decreases

First decreases then increases

increases continuously

Answer

is constant

Explanation

Solution

We know that speed at any instant is the magnitude of instantaneous velocity. And, the modulus of rate of change of speed is equal to modulus of rate of change of velocity. In projectile motion, rate of change of velocity that is acceleration is $\vec{a}=$ $- g \hat{ j }=-10 \hat{ j } m / s ^{2}$ that is downward Hence the modulus of rate of change of speed is $10 m / s ^{2}=$ constant

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