Certain force acting on a 20 kg mass changes its velocity from 5 meter per second to 2 meter per second.calculate the worl done by the force
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Since F = m* a
= 20 kg * (v - u) /t
=20 kg * (2-5)/1 ms-2
=20*-3 N
= - 60 N
Means force is in opposite direction of direction of motion.
KE= 1/2 * m ( v^2 - u^2)
=1/2 * 20 kg ( 2^2 - 5^2)
=10 * ( 4 - 25) J
= 10 * - 21 J
= - 210 J.
Hope it's helpful to u.
= 20 kg * (v - u) /t
=20 kg * (2-5)/1 ms-2
=20*-3 N
= - 60 N
Means force is in opposite direction of direction of motion.
KE= 1/2 * m ( v^2 - u^2)
=1/2 * 20 kg ( 2^2 - 5^2)
=10 * ( 4 - 25) J
= 10 * - 21 J
= - 210 J.
Hope it's helpful to u.
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