Posted by **Mel** on Sunday, November 20, 2011 at 6:04pm.

A tennis ball of mass= 0.058 kg and speed= 19 m/s strikes a wall at a 45 degree angle and rebounds with the same speed at 45 degrees.

What is the magnitude of the impulse given to the ball?

- PHYSICS PLEASE HELP!! -
**drwls**, Sunday, November 20, 2011 at 6:18pm
Only the momentum component perpendicular to the wall changed.

The change,

2M*V cos 45,

equals the impulse given

- A man wants to cross a river 500 m wide which flows at speed of 2 km/hr.the man rows a boat perpendicular to the river flow at 3 km/hr relative to the river.what is relative velocity of boat relative to the ground? -
**Physics**, Thursday, January 12, 2012 at 12:39pm
Velocity of boat relative to the river(vbr):3 km/hr, velocity of river relative to ground(vrg) :2 km/hr. Velocity of boat relative to the ground(vbg): square root of 9+4

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