just wondering?

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a rubber ball strikes a wall at a velocity of 55 km/h and rebounds with a velocity of -15 km/h. What is the change of velocity of the ball?

2006-09-18 16:32:28 · 4 answers · asked by lorenzo p 1 in Science & Mathematics ➔ Physics

if u write -15km/h then u have to replace "rebounds", because this word itself have negative sign so the ans. is -40km/h

2006-09-18 18:16:17 · answer #1 · answered by Ekant 2 · 0⤊ 0⤋

If you remove the - sign you could have a valid ? Otherwise it means the ball no longer exists.

2006-09-18 23:45:17 · answer #2 · answered by gone 7 · 0⤊ 0⤋

55-(-15) km/h=70 km/h

2006-09-18 23:34:43 · answer #3 · answered by astrokid 4 · 0⤊ 0⤋

Im in marching band

2006-09-18 23:34:29 · answer #4 · answered by mellogirl89 2 · 0⤊ 1⤋