1.

3.) A 50 g ball hits a wall at an angle 45° with speed 20 m/s and rebounds with the same speedperpendicular to the direction of incidence. Find the impulseii) A car is moving with a speed x m/s can be stopped by a force in distance y, lf mass of the car isincreased by 50% what would be new stopping distance in terrms of y; force remaining sameOri) Find a vector whose magnitude is 10 and which is perpendicular to the vectors A-2i+3j-4k and

Answer»

3 I)Impulse I = change in momentum

I= mv’-mv

we will take vertival and horizontal component

angle theta = 45’

I= (mvcos45°-mvsin45°)-(mvcos45°-mvsin45°)

vertical resolution cancelout & horizontal adds up

I=2mvsin45

I=2*0.05*20*1\root2

= 1\root2

= √2/2 N-s



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