Question

3.
A particle of mass 10 kg is moving in a straight line. The variation of its
displacement, x with time t in seconds) is given by x = (1-2t-10)m. The force
acting on it at t = 4s, is
(a) 24N
(b) 240N
(c) 300N
(d) 480N
4.
A body is falling freely under the action of gravity alone in vacuum. Which of
the following quantities remain constant during the fall?
• (a) kinetic energy
(b) Potential energy
(c) Total mechanical energy
(d) Total linear momentum​

Answer 1

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mood off hai .........