Aboy throws a ball of mass 0.25 kg straight upward with an initial speed of 20 m/s. when the ball returns to the boy, its speed is 17 m/s. how much work does air resistance do on the ball during its flight?

The work done is 13.875 J.

Explanation:

Given that,

Mass of ball = 0.25 kg

Initial speed = 20 m/s

Final speed = 17 m/s

We need to calculate the work done

Using formula of work done

Work done by the friction

Negative sign shows the friction always against displacement.

Hence, The work done is 13.875 J.

the small 0.38-kg slider is known to move from position a to position b along the vertical-plane slot. determine (a) the work done on the body by its weight and (b) the work done on the body by the spring. the distance r = 0.70 m, the spring modulus k = 154 n/m, and the unstretched length of the spring is 0.53 m

explanation:

-reverse card

i think it would be 5