A constant retarding force of 50 N is applied to a body of mass 20 kg moving
initially with a speed of 15 m s-1. How long does the body take to stop ?
5.6 A constant force acting on a body of mass 3.0 kg changes its speed from 2.0 m s-1 to 3.5 m s-1 in 25 s. The direction of the motion of the body remains
unchanged. What is the magnitude and direction of the force ?
5.7 A body of mass 5 kg is acted upon by two perpendicular forces 8 N and 6 N.
Give the magnitude and direction of the acceleration of the body.
5.8 The driver of a three-wheeler moving with a speed of 36 km/h sees a child
standing in the middle of the road and brings his vehicle to rest in 4.0 s just
in time to save the child. What is the average retarding force on the vehicle ?
The mass of the three-wheeler is 400 kg and the mass of the driver is 65 kg.
5.9 A rocket with a lift-off mass 20,000 kg is blasted upwards with an initial
acceleration of 5.0 m s-2. Calculate the initial thrust (force) of the blast.
5.10 A body of mass 0.40 kg moving initially with a constant speed of 10 m s-1 to
the north is subject to a constant force of 8.0 N directed towards the south
for 30 s. Take the instant the force is applied to be t = 0, the position of the
body at that time to be x = 0, and predict its position at t = –5 s, 25 s, 100 s.
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I don't known . please mark me as brilliant
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idk
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