1) A high-jumper clears the bar and has a downward velocity of-6.00 m/s just bef

Question

1) A high-jumper clears the bar and has a downward velocity of-6.00 m/s just before landing on an air mattress. The mass of thehigh-jumper is 51.2 kg. What is the magnitude and direction of theimpulse that the air mattress exerts on her? Assume that upward isthe positive direction. 2) A model rocket is constructed with a motor that can providea total impulse of 36.0 N·s. The mass of the rocket is 0.191kg. What is the speed that this rocket achieves when it is launchedfrom rest? 1) A high-jumper clears the bar and has a downward velocity of-6.00 m/s just before landing on an air mattress. The mass of thehigh-jumper is 51.2 kg. What is the magnitude and direction of theimpulse that the air mattress exerts on her? Assume that upward isthe positive direction. 2) A model rocket is constructed with a motor that can providea total impulse of 36.0 N·s. The mass of the rocket is 0.191kg. What is the speed that this rocket achieves when it is launchedfrom rest?

Explanation / Answer

2)
Impulse   I   =   changein momentum                      =   m* v   -   m * u    here   m   =   mass                 v   =   finalvelocity             u   =   initialvelocity    36.0   =   0.191 *v   -   0.191 * 0    velocity   v =   188.48 m/s

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