A bomb of mass \( m=1 \mathrm{~kg} \) thrown vertically P upwards with a speed \( u=100 \mathrm{...

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A bomb of mass \( m=1 \mathrm{~kg} \) thrown vertically
P upwards with a speed \( u=100 \mathrm{~m} / \mathrm{s} \) explodes into

W two parts after \( t=5 \mathrm{~s} \). A fragment of mass \( \mathrm{m}_{1}=400 \mathrm{~g} \) moves downwards with a speed \( v_{1}=25 \mathrm{~m} / \mathrm{s} \), then speed \( v_{2} \) and direction of another mass \( m_{2} \) will be:
(1) \( 40 \mathrm{~m} / \mathrm{s} \) downwards
(2) \( 40 \mathrm{~m} / \mathrm{s} \) upwards
(3) \( 60 \mathrm{~m} / \mathrm{s} \) upwards
(4) \( 100 \mathrm{~m} / \mathrm{s} \) upwards
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