Home
Class 11
PHYSICS
A car of mass M is moving with a uniform...

A car of mass M is moving with a uniform velocity `upsilon` on a horizontal road when the hero of a Hindi film drops himself on it from above. Taking the mass of the hero to bem what will be the velocity of thecar after the event?

Text Solution

Verified by Experts

Consier the car plus the hero s the system. IN the horizontla direction, thee is no exterN/Al fore. Since the hero has fallen vertically, so his initial horizontal momentum=0
Initila horizontla momentum of the system =Mv towards right.
FiN/Ally hte heor sticks of to the roof of the car so they move with equal horizontal velocity say V. FiN/Al horizontal momentum of teh system
`=(M+m)V`
`Hence, Mv=(M+m)V`
or, V=(Mv)/M+m`
Promotional Banner

Similar Questions

Explore conceptually related problems

An object of mass 15kg is moving with a uniform velocity of 4ms^(-1) . What is the kinetic energy possessed by the object?

A car of mass 1000 kg is moving with a velocity 20m /s on a horizontal straight road. If the driver applies brakes to produce a constant breaking force of 5000 Newton, the acceleration of the car i s ..... m / s^(2) .

A particle of mass m is projected with velocity making an angle of 45^(@) with the horizontal When the particle lands on the level ground the magnitude of the change in its momentum will be .

A car P is moving with a uniform speed 5sqrt3 m//s towards a carriage of mass 9 kg at rest kept on the rails at a point B as shown in figure. The height AC is 120 m. Cannon balls of 1 kg are fired from the car with an initial velocity 100m//s at an angle 30^@ with the horizontal. The first cannon hall hits the stationary carriage after a time t_0 and sticks to it. Determine t_0 . At t_0 , the second cannon ball is fired. Assume that the resistive force between the rails and the carriage is constant and ignore the vertical motion of the carriage throughout. If the second ball also hits and sticks to the carriage, what will be the horizontal velocity of the carriage just after the second impact?

A 2-m wide truck is moving with a uniform speed v_(0)=8 m/s along a straight horizontal road. A pedestrian starts to cross the road with a uniform speed v when the truck is 4 m away from him, The minimum value of v so that he can cross the road safely is .

A particle of mass 2kg moving with a velocity 5hatim//s collides head-on with another particle of mass 3kg moving with a velocity -2hatim//s . After the collision the first particle has speed of 1.6m//s in negative x-direction, Find (a) velocity of the centre of mass after the collision, (b) velocity of the second particle after the collision. (c) coefficient of restitution.