The ball is projected up from ground with speed 30 m / sec. What is the average velocity for time 0 to 4 sec?

Question

The ball is projected up from ground with speed 30 m / sec. What is the average velocity for time 0 to 4 sec? (A) 10 m / sec (B) 20 m / sec (C) 15 m / sec (D) zero

Tardigrade Admin · Accepted Answer

We should know the displacement in this time. vec S = vec ut +( vec at 2/2) (we take upward as positive) S=30 × 4-10 × 4 × (4/2)=40 m The average velocity will be 10 m / sec.

Q. The ball is projected up from ground with speed $30 m / sec$ . What is the average velocity for time $0$ to $4 sec$ ?

$10 m / sec$

$20 m / sec$

$15 m / sec$

zero

We should know the displacement in this time.
$S = u t + \frac{a t ^{2}}{2}$ (we take upward as positive)
$S = 30 \times 4 - 10 \times 4 \times \frac{4}{2} = 40 m$
The average velocity will be $10 m / sec$ .

Q. The ball is projected up from ground with speed 30m/sec. What is the average velocity for time 0 to 4sec?

10m/sec

20m/sec

15m/sec