Abat hits a moving baseball. if the bat delivers a net eastward impulse of 0.80 n-s and the ball starts with an initial horizontal velocity of 3.8 m/s to the west and leaves with a 5.7 m/s velocity to the east, what is the mass of the ball (in grams)? (never include units in the answer to a numerical question.)

0.084 kg

Explanation:

I = 0.80 N-s (East wards) = 0.80 i N-s

u = 3.8 m/s = - 3.8 i m/s

v = 5.7 m/s = 5.7 i m/s

Let m be the mass of bat.

I = m (v - u)

0.8 i = m ( 5.7 i + 3.8 i)

0.8 i = m x 9.5 i

m = 0.084 kg

that is probably false!

when heated, the valance electrons increased their speed and transferred the heat from electron to electron.   i just took the test.