Q.

The velocity of the CM of a system changes from v1→ = 4i⏞ m/s to v2→ = 3j⏞ m/s during time ∆t = 2s. If the mass of the system is m: l0 kg, the constant force acting on the system is:

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a

25 N

b

20 N

c

50 N

d

5 N

answer is A.

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Detailed Solution

F→ = m∆vcm→∆t = 10(3j⏞-4i⏞)2 = 5(3j⏞-4i⏞)|F→| = 532+42 = 25N
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The velocity of the CM of a system changes from v1→ = 4i⏞ m/s to v2→ = 3j⏞ m/s during time ∆t = 2s. If the mass of the system is m: l0 kg, the constant force acting on the system is: