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F=0.1kg(25m/s-400m/s)/0.1s F=-375N Is this the correct answer for b)?

Which kilogram should I use? The kg for the projectile or the target?

So 1N = 1 kg metres per second squared? So what exactly did I get wrong in the working out?

I'm not sure So should it be 400-25 instead?

So which values should I plug into N = m/s^2? What mistake did I make?

N = (m/s - m/s)/s Those are the units a = (v - u)/t a = (25 - 400)/0.1 a = - 2750 m/s^2 (for the projectile) a = (25 - 0) / 0.1 a = 250m/s^2 (for the target) is this correct?

I'm not sure what I've missed V = U + AT ?

I want to find the average force. V is the final velocity and U is the initial velocity. Their units are m/s Question c) is dependent on question b) being correct. Is question b) correct? if not, what have I done wrong?

Homework Statement A projectile of mass 100g, moving at a speed of 400m/s, collides with a stationary wooden target of mass 1.5kg which is free to move. The projectile enters the wooden target on impact and remains embedded in it. Homework Equations a) calculate the velocity of the target and...