Aball is hit straight up with an initial speed of 28 meters per second. what is the speed of the ball 2.2 seconds after it is hit? [neglect friction.]

The velocity after 2.2sec is

Explanation:

Given information:

Initial speed of ball is

The ball is moving straight upward. So, acceleration due to gravity will act in opposite direction to the motion.

So, the acceleration of the ball will be,

It is required to find the velocity

Time

By using first equation of motion

On substituting,

Hence, the velocity after 2.2 sec is .

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the total distance traveled by the car is

30km + 49km = 79 km .

radiation

explanation:

heat is transmitted by radiation